I never do things I shouldn't have done

I can always tell when something is a bad idea. I know which girls I shouldn't hit on. My problem is that I can never tell when something is good idea. I don't know which girls would want me to make a move, or when. On some level, I don't know what a move is. I don't even know what I would do if I was successful. I don't believe in relationships. I have no mental picture. It doesn't mean anything to me. I don't believe it.