ising, I know what you're going through and I'm 31. Unfortunately it doesn't get that much easier after college. My friends go to bars quite a bit to watch the fights or football games and a lot of times they'll say, "Are you sure? We're gonna be drinking? Maybe next week we'll just all watch at my place," or something like that. It sucks feeling like you're left out.
One thing that is kind of awesome though is waking up the next day and feeling good and not being the least bit hungover when most everyone else is.