One thing about me is that I think my personality has changed greatly (and for the better) though the early college years, even looking back at the highschool years. I few years ago I was pretty much oblivious to everything. I didn't do well in school because doing well in school wasn't a concept that hit me yet. I was anxious most of the time. And I didn't even know or care about building relationships with people (oddly I had a decent group of friends but I don't remember how or why they were my friends). I remember almost nothing of what I did before highschool except the state of mind I was in at various times. I liked to create maps and architechtures for video games.
I don't know when it hit me but at some point I was just a lot more comfortable. I started to realize there were "important" things to do. Knowing why doing work was clear to me. And I was a lot more social. I still had axieties, but they didn't show anymore. When I got into doing things, I was confident, even though my mind would always worry about things. You could describe it as a duck on a pond; if you look at it, it looks very laid-back and comfortable, but underneath the water it's feet are going a mile a minute.
I enjoy going out and drinking a couple times a week, but at the same time, I could take a month or two off a year being completely seperate from the people I usually go out with, then see them again and be fine with picking up where I left off.
I tend to blend in with my enviorment as well. If the people around me are always drinking, I drink, if I'm alone I'll totally forget about it.
Also, for someone who generally doesn't care about what people think, I amazing care about my appearence. I don't think appearence is much a reflection of what's in your head, but I guess it's just an additional thing to worry about. I think of myself as intelligent, but I don't like to come off that way, or tell people. I don't what to seem pretentious or anything. I'd prefer just to look cool and have fun with people, but keep my serious side to myself.