Im so body conscious its putting me down so much?

im 17 years old. i did dance for 2 years at secondary school and have stopped. i put on loads of weight, it got to the point where i could eat a kfc bargain bucket and still be hungry. it turned out i was pregnant when i was on the pill. after finding out, sorry to say but i had an abortion for reasons i cant explain. ever since my abortion my stomach looks constantly bloated, as if im about 6 months pregnant. i have also put loads of weight on my bum and legs and have got so much cellulite i don't know what to do with myself. people tell me i look fine, but in all fairness i wont be happy until im satisfied with how i look. im to embarred to go to the gym by myself and am completely clueless as to what to do with myself. its putting me down so much i cant sleep at night as that's all i think about and will randomly start crying during the day. what do i do ?