I dont know how not to fight

When I was little, I had this rather bad habit of trying to lecture bullies on why it was bad to bully. Of course, that usually resulted in me getting pounded, me running for my life, or my brother trying his best to protect me.

All these years later, I still jump in when I see people getting hurt, even though there is nothing I can do except lecture people from behind my computer, and it has cost me more than I would like.

But I dont know how not to fight for what I think is right.

In Pathfinder terms, I guess I'm a Paladin, whether I want to be or not ...