Perception

What do you see when you look into the mirror? What is it that makes us think what we do about ourselves? If others only say good things about you, and yet you still have issues with self-esteem, why is this? I want to be happy with myself, and there's no reason i shouldn't be. I'm a pretty girl and any guy would be lucky to have me. I can say these things, but why can't i believe them?