I want to loose a **it lot of weight...?

Im 14 almost 15 and female. i weigh 230lbs and is 5'7. i know im heavy big all that crap but ive really wanted to loose weight forever. exersize isnt an a large option, tho i know ur suppose to. and neiither is diet pills. i want to loose round 70 lbs by april tho i know thats imossible, im thinking by june tho. Can anyone help? Please....