I think my friends bully me?

Ok so this will sound really weird but i think my friends are bullying me. They keep saying i look like robbie rotten and playing his theme song when i walk in the room and it was funny at first but now they wont stop and when ever i look in the mirror and look at my chin i get really sad, i know they think its funny but i told them to stop and they wont and its making me really sad and i dont know what to do. any advice please i think im actually depressed and its getting worse.

Can you talk to a close friend or counselor? This is bullying and it's not right. Back in my younger years I would have ignored it the best I could, but now I would bring it to the attention of someone who can do something about it or guide you as to how to deal with it in a healthy manner. Are you also seeing someone like a therapist for your depression? If not at least talking to someone you trust would help set your mind at rest. I'm sorry your life is made miserable by these bullies. Be strong and seek help.