Alright, I didn't read through this entire thread, so forgive me if I've missed anything, but I see what you're saying OP, but I can't really completely agree.
I've heard so many of those token stories where the little kid gets bullied, toughens up, verbally owns or beats his/her bully and is hailed a hero. Unfortunately, at least in my experience, my bullies weren't like that. I have been in physical fights with bullies, both with boys and girls, and numerous slang matches with them, and while when I 'win' it shut them up for a while, within a week they'd conveniently forget and resume their bullying. I also had quite a lot of people bullying me, so telling an 'adult' or the Police wasn't really helpful either as it was hard to find a solid culprit. I also realised that my own retaliations got me into trouble either with the school or older brothers/sisters, so I just stuck with myself, and sunk further into depression and anxiety and 'tried' to ignore them, which didn't work. They still did it, anyway, and it gnawed at me inside.
I did beat a bully once, but she was the classic, archtypical kind who was in my Animal Care class in Year 11 who bullied everyone and had a superiority complex, but when I stood up to her, she targetted me most, however I defended myself once when she went to hit me, and won the respect of many of my classmates for it. This was someone even the Teachers were scared of dealing with, because to be honest, she was an absolute chav.
I think bullying ruins more lives than it helps. I know it's a fact of our rather animalistic society, but it should be as minimal as possible. If I wasn't bullied and isolated, I wouldn't have developed social anxiety and maybe not even depression. Also, many successful people weren't severely bullied, so it's not neccesary.
I'm glad you sorted your problems out and became mentally strong, however I think it's too simplistic if I'm honest.