Congratulations, you have such a powerful belief that can continuously encourage yourself to lose weight. Many people are unable to lose weight mostly because they lack motivation. If you are a senior in high school, you can try drinking a bag of low-fat milk for breakfast and eating a vegetarian bun. Eat less at noon and eat an apple half an hour before eating, because the first thing your body absorbs is what you eat first. You can have some fruit before 5 o'clock for dinner in the evening. When you are still growing, the main thing is to exercise more. If you bounce well, you can lose weight and grow taller.