I'm still only in high school, but I had the exact same problem. I got into high school thinking that it was gonna be a nightmare because I couldn't relate to people my age. But there is a lot of diversity, I'm guessing even more so in college. You'll meet people you can get along with, just like I did.

I feel I already commented on this thread a while back, but I don't remember what I said so I'd just like to add that there's no harm in befriending people older than you, either. Most of my friends are at least a year older than me.