What to do?? Please help?

Okay so I sign up for a summer softball league and I HATE the thing soooo much now. The coach is in it to win 24/7 and its so fricken hot out. So I need help on how to get out of it. I keep trying to talk to my mom (like saying) "Next year Im not doing this league again! It sucks and I hate it" Alls she said was "You shouldn't have signed up." How should I tell her? we paid for cleats, jerseys, and started to fund raise for it. I NEED to get out of it