"1. You find small talk incredibly cumbersome."
I dread small talk. I hate small talk. I find small talk tedious. I plan small talk out in my mind ahead of time. It's stressful.

 Small talk is a skill I've had to put conscious effort into learning since I started as an administrator; I know I am expected to chat up the community, colleagues, and the public as part of my job. I can do it. I feel I can even be pretty good at it. I still don't like it. 
"2. You go to parties -– but not to meet people."
My favorite "parties" involve three to four other people all of whom I know and enjoy their company. Those I will go to every time. I'm not sure that counts as a party, or simply hanging out with friends.
I do go to other parties or events where it's just not possible to only have my friends there. I walk in, scan the room for those one or two people I know, and go sit there. If that's not possible, I find myself a good spot to observe and let someone else come to me.  
"3. You often feel alone in a crowd."
Frequently. Almost always at some point during a gathering I will feel like an outsider looking in. Or if I am actually alone somewhere with a bunch of others around, I don't feel part of a group, I feel alone in a crowd.
"4. Networking makes you feel like a phony."
In general, I have a business persona. My work me can network, small talk, play the host, lead the troops, whatever I need to do. But I don't feel it's the real, authentic me. It's not the me I am in my head. It's not the me the few I am close to in this world get to see. It's the public me, and it's tiring. But I am damn good at it.
"5. You've been called 'too intense.'"
Gregoire goes on to say, "Do you have a penchant for philosophical conversations and a love of thought-provoking books and movies? If so, you're a textbook introvert."
I LOVE philosophical conversations. I LOVE theoretical, in depth, analytical, dissecting conversations, especially with someone who can keep up and conceptualize beyond the pedestrian with me. (I know that doesn't sound humble, but it's true, and hard to find.) The three people I've had the longest relationships with have all been able to do that; so obviously I find the trait attractive as well. I've never been called too intense but I wouldn't be surprised if someone has thought it. This is not something I spring on every person I meet. I have to feel comfortable and on the same wavelength with someone before the conversation take such a right turn.
"6. You're easily distracted."
I live a distracted life. Even the must mundane of tasks have an ADHD quality to them when I complete them. As rational and logical as I am, I can not function in a straight line.
"7. Downtime doesn’t feel unproductive to you."
One of my absolute favorite things to do is a day at home alone in my house, playing on my laptop, watching some crime drama on TV, and browsing cooking magazines. (Notice the ADHA quality even in my downtime.) I love my house. I love to be at home enjoying my comfy couch. I love being alone with my thoughts not having my energies drained with the effort of trying to up hold a conversation. Given my nine-to-five, week-days-only job, I need one of these days at least once a weekend. I don't feel recharged and ready for another work week without it.
"8. Giving a talk in front of 500 people is less stressful than having to mingle with those people afterwards."
Statistics show the fear of public speaking is the number one fear of people, even over death. Me, I never really got that. I actually don't mind public speaking. If I am confident in what I have to say, or if I can fake it without causing a catastrophe, I'm good. Tell me 15 minutes before you want to to get up and talk, fill time, introduce someone... No problem. All good. Got it covered. Want me to go to a social gathering with 50 strangers by myself and make small talk for three hours? Um... I think I need to go home and feed my dogs.
"9. When you get on the subway, you sit at the end of the bench -– not in the middle."
Huh, interesting. I never thought of sitting in the middle of an empty bench. Do people do that?
"10. You start to shut down after you've been active for too long."
Yes. I can feel when it is coming on. I don't know if others notice, but probably; I drift away from the conversation more, daydream more, feel myself sitting back and listening more, I run out of things to add to the conversation. Sometimes it takes longer than others to wash over me, but when it does I start dreaming of being home, in my lovely, perfect house.
"11. You're in a relationship with an extrovert."
Ok, I'm not sure this one is true of me. Maybe it's because I feel like I have such a taxing career I need my little bit of down time to be with someone who is okay with being home and quiet. I really don't think I want all of my downtime filled with activity and people. I do however like to be friends with an extrovert. That can be a good way to meet other people and have some social outlet.
"12. You'd rather be an expert at one thing than try to do everything."
I do get obsessed with topics. I don't know if it means I'm looking to be an expert per se. When I do find an obsession it takes over, to the point where when I am not home researching or planning or creating, I can't wait to get back so I can indulge in those exact things.
"13. You actively avoid any shows that might involve audience participation."
I don't really go to shows, not because I'm an introvert, but just because I don't. I don't think audience participation would matter so much. It would be like public speaking, and I think I could do that.
"14. You screen all your calls -- even from friends."
Gregoire writes, "You may not pick up your phone even from people you like, but you’ll call them back as soon as you’re mentally prepared and have gathered the energy for the conversation."
Okay, I do this, but Sssshhhhh, don't tell anyone. Sometimes I even leave the ringer off on purpose just so I don't have to hear it ring. Especially when I am reveling those downtime days at home by myself in my recliner with Gardens of Time, I'm really not up for conversation. I will have to say I really like the invention of texting. It takes out some of that conversation pressure. I can answer when I like and rewrite it as many times as I like before I hit send.
"15. You notice details that others don't."
Maybe. I've never compared notes. I do think in ways others don't.
"16. You have a constantly running inner monologue."
Constantly. Every waking moment... and the sleeping ones too. 
Years ago I was seeing a therapist. She wanted me to try meditation: Light a candle, clear my mind, and just be still. I got stuck right after "Light a candle". Clearing my mind was impossible. She settled on, "Let the thoughts just flow, don't try to control them". That I can do, just let it drift all over the place. If you're ever want to know what my inner monologue sounds like, watch an episode of Big Bang Theory.
"17. You have low blood pressure."
I do have low blood pressure. And a low heart rate too.
"18. You’ve been called an “old soul” -– since your 20s."
My mother used to say when I was a child I was 8 going on 30. When I was in my 20's, I never understood 20-somethings; they were just so immature. Now that I am almost 40, I feel like my peers may be finally catching up with me.
"19. You don't feel "high" from your surroundings."
When I am at one with my surroundings I wouldn't describe it as euphoria, I would describe it as at peace. The places I connect with are not loud and boisterous and hinge on human interaction. I'm sure you've gathered that I absolutely adore my home. I feel happy and relaxed and content at home. I don't know that that counts as a sensation of "high". I also like quiet, little coffee shops, art museums, quaint bookstores. 
"20. You look at the big picture."
I do. I like the details too. I like to have it all clearly thought out and organized. But I do think having a grasp on the big picture puts everything more clearly into perspective.
"21. You've been told to 'come out of your shell.'"
I don't recall ever being told this. As a child I'm sure people thought of me as quiet and shy, until I got to know them well enough to be really comfortable. Then I wouldn't stop talking. Now as an adult, it's quite possible others may not even realize I'm introverted until I get to know them well enough to feel comfortable and not feel like I have to "perform" all the time. (And then, sometimes, I still don't stop talking.)
"22. You’re a writer."
Hello. Blog. Need I say more?
"23. You alternate between phases of work and solitude, and periods of social activity."
Oh so very true. It's a careful balancing act. If I spend too much time in my cozy little cocoon, I end up feeling like I don't have any friends or social outlet or options of things to do. If I get too overbooked between work (which for me is very social) and social activities, I feel drained. It has to be an intentional plan between time spent active and time spent rejuvenating. 
I've recently learned to be more calculating on the voluntary social activities as well. Big groups of people I don't know or may only be acquainted with one or two people take a lot of mental preparation ahead of time. They are exhausting. They don't promise a whole lot of guaranteed return. Small groups of only three or four are much more manageable even if I don't know anyone there. It's a better calculated risk.