For your junk food prob, try putting the food into baggies, a small serving per bag. Each day tell yourself you can have 1 or 2 bags and if you eat more than your supposed to, skip one tomorrow. Then try and get some exercise, take a walk, do an exercise tape ex... For your meals, ask your mom ( if she makes them ) to give you a smaller serving. Eat only when you are hungry, and try not to stuff yourself. Good luck!