The Sad Truth

I'm a 16 year old girl, and my weight is 136 pounds, and my height i 67,3 inches. I've have dealt with so many insecurity problems, and have always had low self esteem. Not one day goes by where I'm not ashamed of my body. I use hours in front of the mirror, picking out the outfit that won't make me look to fat. I always end up comparing myself to my skinny friends, and I'm disgusted with my self for not looking like them. I constantly try going on diets, but I never loose anything, even though I really really try. I constantly lie to my parents, my siblings, my boyfriend, and my best friends, by never telling that I'm on a diet, cause I feel ashamed that I am. Like I don't want people to realise that I know I'm fat.

I just wish for a beautiful body, so that I can wear jeans and a bikini without feeling so uncomfertable and bad about myself. Thats my story basicly. Please give som advice? does anybody know any good diets so I can become pretty? I already work out 4 times a week, seeing I am dancer on elite level, so it has to be in the more extreme end. Please please help me. Anyone in the same situation?