How are you? I am writing in response to your e-mail. I would really like to help you. I will give you some advices to what you should do.
First of all, I think that you should talk to your friends and ask them not to tease you, because you do not feel well due to it. Remember, if they are your friends they will certainly understand you. You can also take care of yourself, eat healthy food and do some exercises.
I wish you good luck and I hope everything will be fine.