I didn't/don't drink either, and neither did my circle of friends, and although I would almost never be caught dead listening to the music at my prom of my own free will, it was still danceable, which is more than I can say for a lot of the music at some of the conventions I've been to. And even people who really like to drink can be worth getting to know rather than dismissing offhandedly, or at the least be incredibly entertaining once they're a bit tipsy.
Why was there alcohol at your prom, anyway? Are you outside the US?
I guess the point I'm trying to make is that it's my (perhaps idealistic) opinion that nothing can stop you from having fun except you. I've been to two proms, the first of which was at a completely different school where nearly the only person I knew was my date, whom I'd only met twice, and I still managed to have fun by taking the floor and getting to meet new people. Granted, perhaps that's just been my experience, and I may just have been extremely lucky in going to proms with half-decent DJs and half-decent people, but for what it's worth, I've never not had fun at a dance (formal or otherwise) since the eighth grade, regardless of how few people I knew, how much alcohol was involved, or what kind of music was played.
