Guitar Lessons

I am quitting guitar lessons. I don't want to and at the same I want to quit. I think that I know everything there is to know about the guitar. There is a lot of stuff that I can work on, but as far as knowing how to play it, I know all that. The thing that sucked is that my mom is going to put me in piano lessons. I hate the piano (sorry for any of you piano players) but it is just a calm instrament, and I need a heavy metal/rock instrament to play.