I have cellulite all over my stomach and I've tried to get rid of it, but it doesn't seem to change

Most people don't "lose their chest" unless they diett rapidly and excessively, so if you are carrying extra weight in general by watching what you eat, doing some aerobic exercises and some wiehgt training can help.  If it's an actual skin texture issue you might talk to your folks about seeing a dermatologist to find out if there are any surface creams or laser treatments - but if it has to do with "fat deposits" - you're going to have to tackle that first.

Finally, the same self-tanners creams/lotions that tan leg cellulite and help to camoflage the areas a bit - may also helf your torso.

Finally I'd get fast food and processed food out of your diet since it certainly doesn't help your waistline, your skin and may be having an impact.

Healthy eating habits can help.

Drink alot of water, if you are thirsty you may already be dehydrated. Water gives fat a ride out of the body, and dehydration can cause you to retain water.

If you are craving a soda or something sweet, drink a large glass of water. If you still crave it, you can have a little. You will be surprised what being thirsty will make you eat and drink.  For my sweet tooth, I sometimes eat plums, grapes, or apricots(not to excess)

Replace a couple of meals a week with Lean Cuisine(this is my favorite brand) or other low cal. meal, and eat home cooked meals (this basically means that it didn't come out of a box. The more fresh ingredients you use the better)the rest of the time.

When you go out to eat, avoid the fried food as much as possible.