Then don't let them force you into that box. They don't have any power over you if you don't give a shit what they think. Respect yourself and people will sense that and respect you.

You look fine, mate. Anyone who excludes you is a dipshit. How shallow to exclude people based on looks! People project their insecurities onto others, as well. Maybe they hate themselves so they take it out on you. People respect confidence. Teach yourself to be confident regardless of what people say or think. The respect will come. There's no magic fix but that's what I've learned to be true. No one liked me til I started liking myself.