How to lose 60 pounds for a 180 lb. ,5'3 , 13 year old? over summer!(:?

please help me! i really need to lose weight to lok great and be healthy! i will do whatever it takes..juust plzz giv me a reasonable diet and exercise plan..i would reaaly really really appreciate! i also need tips to lose weight..please be legit..cuz iam going to try what you post on her.iam just tired of gettng picked on by my brothers and vball coaches..they make me run more cuz of my size..vball is in the fall, i wanna shed some weight befor that.