Can someone please tell me whats wrong with me?

Hey im 16, i count every single calorie i put into my mouth, if i eat more then 500 calories i throw up whatever i ate. its so annoying, im not doing it for attention, i honestly feel like i have no control over it. I've been doing this for about 4 months. I haven't lost any significant weight though. Is this an eating disorder? Please only serious answers. thank youu.