Look mate, just relax. Us girls aren't anything to get that nervous over. If you want to get along with girls you simply treat us as actual human beings, talk to us, make jokes, don't be a creep. If you have good hygiene, don't behave like an ass and don't behave like the only thing you want is to get laid, then chances are that you'll do just fine. Not good talking to girls? Practice by talking to girls.