I'm pretty self-centered unless it suits me not to be.
I try to help or answer questions whenever I can, but only because I enjoy being able to do so. If I'm not feeling sociable for some reason, I do not hesitate to ignore people. I'm helpful with strangers, and teasing (often to the point of being annoying) with friends - strangers think I'm very nice and kind, and people who know me accuse me of being either unemotional or too emotional, and of answering their questions with "riddles."
I analyze things to death, but will often stop abruptly mid-analysis if something fails to hold my interest.
I like to watch people more than I like to talk to them, unless I'm just talking to hear myself think (I may be doing that now).
I like kids, but I don't like it when kids act like they're superior in knowledge, even though someone is trying to help them. I also don't like it when people are rude, mean, or condescending to kids. Probably because mentally (well, socially), I pretty much still am a kid. Though oddly, I am the kind of kid I would not normally like.
I will take any opportunity to talk about myself, even though I often pretend to be reluctant to share information. I like an audience, but it has to be a willing one. If no one pays attention to me, I get moody, until I find a different way to get attention.
I usually dress to stand out just enough - not like a sore thumb, but not to blend in entirely.
I don't mind just sitting quietly in a room with someone and not interacting with them or anyone else.
For someone who dislikes writing, I always end up writing a lot.
I'm not very consistent as a rule.
All-around, if you don't know me quite well enough to just ignore me, I'm a fairly irritating person unless I make a strong, conscious effort not to be. I'm pretty good at that, though, if I'm motivated enough.