How can iLose weight fast before my freshmen year of highskool starts.?

Well, im a 13 year old girl who has a weight problem...im about 184 lbs. & my height is about 5`4 -5. iVe had this problem since iwas in 4th grade cuz iAte my way through stress because we moved alot & sometimes iEat my feelinqs. But now im sick of it. iKno 4 a fact this isnt who iam. Plus, iWant my highskool life 2 be the time of my life witout worryinq. My promotion is coming in May so im trying 2 lose weight for that so ican fit into a dress. But to sum it all up iWant to be at least 40-60 lbs lighter by august 3...the first day of highskool. Plz help me. iReally need it...