I wasn't actually aware of the whole extrovert and introvert thing until the past summer. It explained a lot. As a kid I always heard things like "You need to come out of your shell" or "You should join more groups to make more friends." My shell is quite cozy, thank you very much. Perhaps I was shy as a child, but my shell hardened sometimes during middle school. At one point, I didn't feel the need to be social.
After watching MLP I started to open up a bit more, but I'm still reserved and selective about who I'm close to. I did get to courage to talk to a girl who I considered an enemy in middle school. Now we're best friend and she's the only one who knows how to bring out my inner extrovert. I actually do wish I could spend more time with her outside of school, and that's a first for me. Asides from her, I prefer to read, write, and draw in solitude.
Is it me, or are introverts more likely to socialize online? I'd rather join a forum with thousands of people than join any of my small school clubs. Than again if someone opened a MLP club I'd probably consider joining it.