How to get my mom to stop bothering me cause of my....?

high metabolism??? i eat ALOT and she eats very little so she thinks that if a pop tart fills her up then it should for me when im 110lbs and active in like everything so im HUNGRY!!! like, everytime i eat something shes like "thats too much" or "you eat like a horse" its like pissing me off cause shes always on me about eating too little when she barely eats so wtf shes not one to talk so how do i get her to understand i have a really high metabolism!!!!!! cause im ALWAYS HUNGRY! [IM 15 BTW]]