Getting better with girls ? ?

Ok so i am an average teen just finished all my exams and about to go college in England and before i go there I wont to get better with girls, the thing is I am not bad with girls just once i discover they have some sort of an attraction to me I become a wimp and just forget everything and can't seem to talk to them, one on one i am ok but when in with a group of friends there is bearly any contact at all, you might find it pathetic but it is a serious issue for me and I don't know what to do ? And no affence to men but I think this would be better awnsered by a woman :)