I was bullied in high school, too, but thankfully I managed to break free from it. I didn't "stand up for myself" like people think this occurs normally, but in the end, I was the last who stood the field. Bullies are usually more than capable of walking themselves into oblivion, so I just patiently waited for them to do so.
But it affected me in such a way that I will always stand up for someone else, I just can't help it now, I just see red in front of my eyes. I'm not proud too much for this, but when I saw a boy pick on someone his age (they were clearly not friends, you could see that from a mile away) I called out for him. He ran away, but I caught up with him and told him that I now know his face, and if I see or hear about him pick on someone like that again, I will make his life miserable. And if he thinks this is somehow unfair, I'll tell the school board that he stole from the other kid, and that I didn't want to get the police involved, but that I will force the issue if he will. He was shaking and on the verge of tears, but I think I really got through to him. I made him apologise to the other kid and that was it. Like I said, I don't feel proud about it, but at the time I thought an honest threat might do more than anything else I could do at the time.