Hang in there, hun. Divorce is really hard - but in time, you will find it could make things better in a way. Your parents have been unhappy for a while - after the divorce they both will be feeling the same type of loss you are - but with time, hopefully they will both find happiness, and you will be happy for them. I know thats a very rambly sentence but I can't really say it any better.
As for college - its definitely scary to move out on your own - but you're starting anew, just like all the other kids, and you'll find you make new friends very fast. College is the time of your life. Its so much hard work, but so much fun. The friends you make here will be part of your life forever. Everyone (all the freshmen at least) is going through the same scary changes you are, so you'll find lots of support. My college friends are like sisters to me. Its a great experience, you grow up a lot and learn a lot about yourself (and the world) in this time. So hang tight till september, its really going to be ok - even better than ok!! :-)