*tosses a thermos of herbal tea over to her* Chill.
Don't stress it! Find a group of people to go with. It's a lot less awkward than being by yourself or going with "someone" and feeling obligated to hang out with them the whole time. Considering it's early in the school year for most, there's gonna be a lot of people just standing around. Introduce yourself! Find that classmate you've been dying to get to know better.
Dances are a lot less scarier than you think they are. Believe me, some people are stressing out more than you are.
Plus, if you don't like the dance (and your school allows it) you can always leave early!
If you can't leave, don't sulk in a corner or by the food. Go and dance! Even if it's just doing the Macarena in the corner with all the wallflowers, ypu'll find dances are a lot more fun if you let yourself loose and be part of the group.
I know how you feel, I've got homecoming in three weeks and people are already pairing off....