What is wrong with my body?

I'm tired of it, seriously.I personally think that although other people can look Beautiful nd not be skinny, that I'm not as lucky. I've been dieting on and off since I was 12, and I'm 16 now although I'm thinner(I was larger then), I'm not where I want to be. I'm 5'2 128 lb and I have about 27% body fat...and that's above average,even poor for my age. I BARELY eat anything packaged(90% of the time its a protein bar,oatmeal, etc). I asked a trainer at my local gym and some how some way i look not out of shape even though the stupid chart says I have poor body fat percentage. I want to be skinny. I don't care how to get there anymore, anything works for me as long as its long term..I don't even mind bulimia(but i hate it if its constant, i did it for a few months but i couldn't bring myself too keep doing it..enough you know, for it to show.) . I know my bodies fatty,some lady at the gym told me i have cellulite and looked at my friend and her she was fine,and I didn't let it show but I cant stand it.what do I do???