I went with a CHA build and never really had problems with bullies, put put a lot of ranks in deception, persuasion, performance, intimidate etc.

Everyone is saying 'recruit other kids that have been bullied', nah. Outside is a tough game. It isn't "Revenge of the Nerds". Not that you shouldn't befriend your fellow downtrodden and there's definitely something to be said about strength in numbers, but let's be real, you want winners on your side.

That said, charisma rarely gets the job done on it's own. If you have any buffs to your INT also you can help stronger or more popular kids with their classwork and then use your charisma to get on their good side. The same can be said with all of the other stats. Pair WIS with CHA and you'll earn admiration as a kind and clever ally, pair CON or DEX with CHA and join a sport or club.

Tack on the CLASS CLOWN feat and you'll have allies literally throwing themselves at the chance to join your party.