How can I stop overeating?

I'm 17 and 5'2½, 197.7 lbs, probably more now. I can't stop eating, it's seriously a problem. I eat to the point where I make myself sick, even when I'm not hungry at all. I've tried to talk to my family members about this numerous times as I've always had problems with food, but they blow me off. My family hates cooking, so I never have anything to eat besides sweets and junk and they never keep me full. Just 2 days ago I ate a whole container of ice cream by myself in one sitting. No matter how hard I try to stop eating I just can't stop. I don't know who to go to or what to do anymore, and I know it's the reason why I gained weight I had lost back. I don't know what to do anymore and I'm at a loss for hope.