I know what you mean, I started high school last year and I weigh 140, true I am taller and stronger, but nevertheless I still struggle with my own weight constantly. If only I could wear ANYTHING I wanted. My advice to you is the advice I follow myself, #1, you MUST excersize to lose weight (I learned the hard way) and doing something you actually enjoy makes it so much more fun. I walk/run/dance anything. My motivation is to be able to wear the nice tight jogging clothes without my pudgy hips and side of my chest bulging out ewwwww. But anyways, #2, is when you feel you want to eat, think about your goal, is this one fatty snack going to be worth setting yourself back? and then move far away from the kitchen/food source. #3, Become health wise, learn about healthy foods, and learn to love being healthy. It all will work if you have confidence and dont give up!