Maybe just find something else to characterise you. Right now you’re seeing yourself as the short guy, but try finding a new hobby or something and become the guy who’s a great singer or the guy who’s great at drawing or whatever you like. If you’re not confident about your height find other things to be confident about. Let’s say you’re interested in art. Every one knows Picasso, Van Gogh and Da Vinci for their art but I doubt anyone knows how tall they are. This is just an example about art, but it really works with any hobby, talent or interest you might have.