@mm I've had days where I rage in pvp. What I do when that happens, is simply turn the game off. It takes me 1 min to realize how silly it is that I'm getting worked up over a game.
You basically have 2 options.
1- conform to the unwritten rules of pvp, and be peaceful.
2- rush everything in site, including friends. If a friend gets mad at you, or no longer likes you, that person is lame anyways. I have plenty of friends that I rush, or rush me.