15 yr old interested in boxing?

k so im 15 years old and really want to join a boxing gym. Im use to playing contact sports I played football for the last 6 years. Anyway my mom wont even discuss it with me she is worried im gonna get the **** kicked out of me. Also I was only born one kidney which my mom is also really worried about. Do u get punched in the kidneys alot in amateur boxing? dont you wear a protector around your waist? Anyway Please any advice or things I could say to my mom to let me box, THANKS