First I wanted to say that I've never tasted (or plan on tasting) a sip of alcohol in my life. (Is that a world record?

)
Anyway, I'm 21 and finished my junior year of college, and I've never attended any parties or contests or anything like that. So why do most people my age do these things?
Why do so many people like to go to bars, get wasted, among other things.
Also, what exactly "happens" to you when you get drunk? (I'm mean from a scientific and chemical standpoint.)
I just don't see the interest....