Good ways of losing 50 pounds?

Hi! I am 13 years old and weigh 170 pounds.. I've been heavy almost all my life, but I would like to tell you that my parents are always busy and unless I do a sport at school then I can't do any I actually wan to do. They have cheer, basketball, soccer and feild hockey at school, I really want to lose weight before the summer too. Thank you!!! If you don't mind which one should I take to lose the most weight? Thank you and please no negative comments. Also if you have a routine that you can share with me I would appreciate that!
Soccer
Cheerleading
Basketball
Feild Hockey
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Good ways of losing 50 pounds?
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