tell them hi and that they're pretty or whatever. you make it harder for yourself than it is. ask them if they've seen any good movies, read any good books, if they have simblings, play any sports, whatever. act like you're interested in getting to know them. just open your mouth and let the words come out. even if it sounds stupid, just do it. the only way a girl would snap at you for saying hi and that they're pretty is just mean and you don't want someone like that anyway. and if a girl rejects you then she rejects you. there's billions more of us out there.