A lot of things have been said already, but I'mma add somethin. what is sure is that you need to be more self-confident, for that, I've got a little advice that might be useful : if you're scare of going to a guy or talking to one, imagine him in an embarassing situation, naked or whatever goes on your mind ! And if he rejects you, never think you failed !! but tell yourself you don't loose anything !! There're a bunch of men on earth...