Don't worry about girls too much, uni is so different from high school socially that you can sort that out when you're there. Also (at least at my univeristy) there are a hell of a lot of parties organised by the societies in which you only have to be a member to go, so just join up to a couple and have a good time.
Good luck getting into uni though.
@Kamal. You can be a Muslim and still party, in fact one of the biggest party animals I know is a Muslim and was 100% sober at all of them.