This sounds like the school are really letting you down by not supporting you or taking action against the bullies. Are your parents aware of the problem? Or are there any student services available to you? If not, then you may have to consider schooling at home to ensure your education is not affected until matters can be addressed properly. Also, you should be able to talk confidentially with school staff about this. If this is not happening then you should talk to the local education authority or contact the school board with your concerns. It would be good if you are supported in this by a parent or responsible adult.