First of all, bullying someone is NOT acceptable and you shouldn’t tolerate it. Ever.
Is there a teacher, administrator, or social worker at your school whom you can trust? Try talking to them for ideas on how to stop the bullying without resorting to violence. If you don’t feel comfortable doing that, GLSEN has a Safe Space Kit you can check out here: https://safespace.glsen.org/
Remember that everyone deserves equal access to education and has the right to feel safe and comfortable in school.
Just know, you deserve better. And it will get better. Hang in there.