I agree that you need new friends. You don't sound like a stick-in-the mud at all to me.
I like dancing, but I prefer social dance, which requires some basic skills. I like dancing the salsa, jitterbug, the lindy, etc. I even like dancing the two-step and the merengue, which are pretty darn easy, but are still about dancing with a partner (when you have a good lead, not a groper!:). I am not snotty about it - it's just what I like. I am bored by the other kind of dancing.
I like good beer, but it needs to be combined with social dance, or a music jam, or some kind of game with friends, or a conversation with a really, really funny friend. Just drinking to drink? I don't get it. Again, to me, this is boring.
Your friends are focused on booze and men. To me, nothing is more boring than that. Maybe you aren't reserved - maybe they're, um, boring.
Don't give up. You will find your friends. And they won't think you're a stick-in the-mud. They'll think you are a smart, complex woman, with varied skills and interests.
Best of luck to you.