I've been in karate for over six months now and I never liked it since day one. I beg everyday not to go but my mother and father force me to. I'm not very good at it, and I move at a much slower pace than anyone else in the class. I feel like I'm not really learning anything because right when I get home after class I forget nearly everything I have learned that day, and because I feel like I will never even be able to use it to defend myself. How can I convince my parents to let me quit?