Pre-teen/Tween wants to lose weight?

First, your weight is perfectly healthy and normal for your age. If anything, you're slightly underweight. Second, dieting at your age can be dangerous and cause health problems for the rest of your life. You need to eat healthy foods. Quit drinking soda immediately - not only does it have a lot of empty calories, it can cause problems with bone density. Drink skim milk instead - this will give you vitamins and minerals that your body needs. Eat lots of whole grains, fresh fruits and vegetables. Cut out junk food.