I know this sounds so lame, but keep plugging away with life.
Do some of your favorite things, listen to some of your favorite music...
It is hard when there's so much out there going on at once - friends, boys, school, etc. - don't know if this helps or not, but maybe pick out a couple of things you want to focus on for a certain length of time - say, friends and school? You're going to hear the mother part of me come out here - don't give up on school, you've gotten this far, decide to finish it up by doing your best. Doesn't mean it's got to be the top grade, it just means doing the best you can. Boys come and go - they will still be around when schools all finished (yes, I know there are boys reading this too - it goes for you too - there will still be girls around when you're finished with school too).
Don't be too hard on yourself, ok? You are a valuable person and worth knowing - just that there are some folks who haven't figured that out yet.
Find something fun to do to get your mind off the counting down to school - easier said than done, but try and hang in there.