Why do girls sometimes stare at me and smile ?

people say I'm attractive and that I'm a "catch," the trouble is I can't see what they mean for myself, I have no idea how to approach women, even less how to talk to them. I'm not fishing for compliments and I'm not going to post a photo for you to rate...I'm just wondering what girls mean when they make eye contact with me a lot...I just think they must be mad lol