I want to play volleyball, but my mom won't let me.?

I looove volleyball, and I've always wanted to play. My parents didn't want me out for AAU volleyball because you're at some kind of tournament every weekend, and you don't really get family time like you should. I understood that, but now I want to play school volleyball, and my mom won't let me. I don't know why. How can I ask her why I can't be in volleyball and to talk her into letting me play?