One thing that most people tend to forget about losing weight is that you can't just diet, you need to exercise as well. Exercise not only strengthens your body, but also burns a lot more calories than if you were just dieting. You can eat more and increase your metabolism with more frequent exercise. This can help you stick to your diet and get in better shape. Just remember not to go too low on calories, especially when exercising. I'm 16 years old, male, participate in sports, and run at least four times a week. As a result, I eat about 2700-3000 calories a day, but obviously thats going to be much different for you. Just try to balance your exercise and diet so that you can stick to it healthily. Its also not bad to treat yourself once in a while, especially to keep your morale up.