You are perfect. Don't let people lead your life based on their words. Does what they say hurt? Yes. Believe me, I know. Is it hard to ignore? Yes.
But, don't let what they say bring you down. There are 7 billion people on this planet. Don't let 3 people being you down.
Find something that makes you happy and stick with it. If it makes you happy, you should hold on to it. Don't falter your personality because someone's bullying for it.
I know this may sound hypocritical to people who know all my secrets, but don't hurt yourself. All it's going to do is hurt and make you self-conscious about your arms or legs or wherever you decide to do it. Eventually, it may start out in tiny scratches, it'll get deeper and deeper and maybe too deep. Please don't be another face of a dead person.
To everyone, you are beautiful. You are perfect the way you are. Never stop being you. Your light shines bright. Don't let them bring you down. I know it's hard. Honestly, I do. But there are 7 billion people on this planet. Don't let a few morons bring you down.