Im 13.....If I dont eat four a long time what will happen!7!7!!77777?

What will happen If I excersice MASSIVLY and dont eat or eat very little like anorexics ,,will I ummmm posibly lose like 5 pounds a week or what!!!!????? And do you really die cus Anorexics dont eat and drown themselfs In bodykilling excersice and yet there still here walking down runways like anorexic models and plus on tv this girl Is 29 and used to wiegh 49 pounds ....I now shocking!!!!! And so you dont die!!!!!!!!! So what happens any tips!!!!! And how to hide It and how to survive!!!!! Pleas no critics plus Im 13 and 165 pleas help....If I lose 20 pounds will I look okay now okay now