When someone bullies you, you should not feel bad about yourself. You are being bullied because you seem to be an easy target. A bully is someone who puts other people down so that he/she can start to feel better. You should not give the bully the satisfaction of showing how affected you are with the bullying.
Talk to people about it. It is very likely that you will be given advice on the things that you should do to prevent the bullying from ever happening again. Take note also that you do not deserve to be bullied. There are some people who let it happen because they begin to feel that they deserve it. You don’t. Nobody has the right to make you feel less of the great person that you are.