I'm sorry that you're dealing with bullying on a regular basis. I understand completely how you're feeling as I too have dealt with bullying.
In my experience, I dealt with both physical, verbal and cyberbullying over a three-year period. I share a similar experience with people attacking my appearance and telling me to go... so I can reciprocate. It definitely hurts and makes you feel like crap but what I have learnt is that bullies often have issues of their own, whether it be within themselves or their home environment etc. These bullies then project these negative thoughts and feelings towards someone vulnerable as they haven't yet discovered another way to deal with their issues.
I know how hard it can be to ignore and speak up at the same time to defend yourself. Have you spoken to the school principal about it?