I think im becoming obsessed with my body... Please help?

Im 18 year old guy. I've been overweight/fat until i was 14-15 years old where i gained a more normal weight. This had left me with back + chest acne and puffy nipples, and a big/fat butt (seriously). I have also gained some smaller stretch marks/spots. Basically, i've NEVER been happy for my body and its really making me self concious. I have tried to cut to after 2 years of gym and im now on a 12-13 fat percentage but still puffy nipple and butt. I can't wear the jeans i want to, because it will look ridiculous and im forced to wear stupid baggy trainers and even then i sometime become worried it is noticable... I seriously cant/wont tell my parents or family about this and i don't really keep contact to my friends after leaving facebook and i dont really want to tell any of them neither. Its just making me really unhappy and today it ended up in coming home late at night and just going out in the kitchen at 1AM and eating a lot of baked cake and sandwich with bacon mayo and chicken... This is the first time ever this has happened, and its really warning and im afraid i might break down or something and just totally relapse all the way back to the fat kid and just give up... Please help...