Oh, wait this is probably for personality isn't it?
Most people don't like to describe themselves to strangers. I'm one of the crowd in this respect. It seems like you always end up just kinda describing your current mood to someone, giving them a tiny snapshot of you. That's what the nerd joke was for, I'm feeling particularly nerdy at this exact point in time. People around will have to deal with that sometimes... Not all the time, but I do get in that sort of mood.
I'm introverted, but not socially incapable. I actually like being around people, rather a lot, but I'm usually limited by how much energy I've got at the time. Although, this I think most people can relate to.
That's your snapshot. You'd probably have to talk to me to get the uncropped version.