I usually score as mildly extroverted on personality quizzes. The question of whether you are drained or energized by other people is a very tough one for me. It depends so much on who the other people are. I feel like I'm moving more towards introverted as I get older.
At work, I have my own office, yet I find myself wandering out to the group space quite often, sometimes even lugging my pile of work out to an area with other people.
Internet forums really appeal to me because I have a desperate need to talk through things to make sense of them in my own head. My family and friends already listen to so so much. I don't really have a good enough sense of fashion to strike up conversations with strangers about it, and when I talk with acquaintances about things like bookending, they give me a look that tells me I sound a little off my rocker.
My two kids are at polar opposite ends of the spectrum. My youngest can stay home for weeks on end, with no outside interaction, and be happy as a clam. It has been suggested she may even have a mild case of selective mutism. My oldest craves school for the interaction with her peers. She has said that she'd rather be in a room full of people she dislikes than to be alone. She desperately hates being alone. It's interesting to watch the way the two of them, and my husband and I (he, a bit to the introvert side and me a bit to the extrovert side) all interact with others and each other.