your situation seems very hard to overcome. Try getting a jump rope and clear a spot in the house.each time you jump try to push yourself to do more. well when your mom goes to the store, go with her and say mom, that's too fatning to eat and i would perfer if you wouldn't buy it because it encourages me to eat it. also, just try to play lots of sports and drin aolt of water. in most cases, water makes you really full so drink like a bottle a day.