More seriously though, people are saying "stand up for yourself" all the time in this thread. Great. Congratulations, you passed the test of life. You can stand up for yourself; you do the right thing and teach your children to stand up for themselves; you can withstand the pressure and show it to your fellow humans what it means to possess a healthy ego and make it meaningful. How about those that aren't? "Oh they're pathetic"? In my opinion that kind of attitude is almost as bad as the bullying itself. You're just contributing to the ostracism and isolation even if your intention is the very opposite
I don't think anyone IS saying that. What people are saying is that the only way to be sure not to be bullied is to stand up for yourself. You may wish that wasn't so, but it is. So the earlier in life you realise that is the answer, the better.

Anyway, in the spirit of being helpful, if you cannot realise this is so, or cannot act on it (and some people can't, and they deserve not to be bullied too) then my advice is to try to arrange your adult life at least to be in an environment where there is as little bullying as possible. Some sort of low to mind ranking job in a fairly structured environment? (Actually, the structured environment reminds me of another bit of advice for people who can't stand up for themselves who are still at school: give a martial art a go. Plenty of discipline in the lessons, (if you get the right instructor: if you get a macho meathead, leave), and after a few months to a year, much more self confidence. And the right kind of self confidence too, ie, you could handle yourself, but you don't need to prove it to anyone.)