Hey SXYBNY
I am 18, i recently went thru a very bad period with the same thing as yourself. I prety much was anorexic, focussed on low fat, not much caloires, sometimes i would only eat an apple for a whole day.
I still have bad days, but when i told someone who knew me it really helped, mabye talk to a girlfriend about the problem (some boys dont get it, and bf's will just say ur beautifal).
whatever you do dont compare yourself to others, expecially magazines, my mother recently showed me some airbrushed photos from her work and its just crazy what they can do.. those ppl are not real and Celebs have Dietitins, chefs, Personal trainers, makeup artists and every other thing they need to look glam... they arent a real guide.
you sound like your trying to do the right thing.. i hope i helped
p.s i have channeld my intrest in fitness/nutrition into a study and am now becoming a PT. (just lettin ya kno

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