How can i lose 80 lbs in 8 months?! or 10-15 lbs a month?please help i'm 13 , and 180 and is 5'2?

please help me lose this weight..i dont wanna die young or get any diseases or diabetes..i am very entergdic in vball and cheer, and will do 2 workout videos along wih anytyhing you guys give mee!! i just reallyy need to lose weight..for my eight grade year also,and does anyone know what results to expect in zumba?(: thnkyou God Bless <3