Help stop food cravings?!?

Hi, my name is Austin I am 13 years old i'm a guy. I used to weigh a whopping 220-221 lbs! I then lost 82 lbs and i'm no longer over weight. And lately I have just been stressing over all food! I haven't had these cravings before and they just keep getting bigger and bigger! My mom doesn't respeect the fact that I don't eat junk food and she still buys chips, makes cookies for her boy friends, pizza, cakes, pies, all the bad crap!! It's so hard to do I have to skip meals because the meals she makes are too fattening! And all I think about is, doughnuts, ice cream, pizza, Dairy Queen blizzards, pop, i'm going nuts! And I get so mad when I see these skinny kids out there eat what ever they want and not gain a pound!!!! I'm active! I walk, workout, and do exercises but I'm too afraid about gaining weight again I stress myself out over it. For dinner my mom made tacos and she said she was going to cook healthy! Today she simply said "I can eat what I want to eat and you should make everyone eat like you do" and she compared that to "being gay and wanting everyone else to be gay" what?!?!?!? If you ask me my mom is being wayyyy to selfish! She used to be obese herself but she got that gastric bipe surgery back in December of 2007. She is always eating chips and dip, cookies, ice-cream, she eats in front of me, and her boy friend in skinny too! And i'm skinny but I still feel FAT and I just want to know how to stop these sugar and fat food cravings. I get so tired of walking into a store and seeing cookies, and cakes, pies, and sugary breakfast cereals, like, recess puffs cereal, rice krispies treats, cookie crisps!!!! uhhhh and when I see good old Taco Bell and mexican restraunts!!!! And mom always eats popcorn! So please i'm sorry this had to be so long but could you help how to control my craving even when I know I won't eat! I just want to stop thinking about food!! I haven't had a single sweet or fattening food for like 6 or 7 months!! HELP!!?!?