I know Death-cap means well, but I completely disagree with him or her. It's not your fault that you're suffering at the hands of bullies. It's not because you're weak or you need toughening up. I can't tell you how many times I hear people say stuff like this to victims of bullying. It's part of a widespread misunderstanding of what is effectively a form of emotional abuse. For some reason, while there are laws against the bullying of adults, it's somehow considered a "normal" part of growing up.
Psychological strength is formed through loving relationships, not by being sent to boot camp. You're not going into a war zone, you're a teenager going to school. And what you need is some kind of support network to help you get through this. Do you have parents you can talk to about it? Relatives? Friends? Does the school have counsellors? Whatever you do don't isolate yourself during this tough time, because otherwise much of your adult life will be spent trying to repair the damage. Trust me on that one. And let us know what you think your options are.