Well, I [b]never[/b] studied in an all-girls school, either, so I don't know if I'm one to give advice.
Anyway, to be honest, it's kind of sickening to be around the same gender every single time. You see them what, 5 times a week for 8 hours?

Hanging around with girls is fun, but there are just some instances wherein hanging out with boys is [i]more[/i] fun.
I'd hate it, too. But... I guess it won't hurt to give it a shot, right? ^^; You could always voice out your complaints to your parents once you've tried it and you really hate it there. I'm sure they'll understand.