Hi I am 13 and weigh 215 Ibs. I dropped out of school cause I'm fat. I try to eat right but It's my parents who buy the food not me. So what I do is every night before bed I do 30 push-ups I also cut down on food like at dinner instead of 2 plates I eat 1 plate. My friend lost 90 Ibs from just exercizing and staying on a set diet, then she picks a certain day of the week and pigs out on that day, It was hard at first but it works It takes time but till then have confadece in yourself. I wish you the best of luck