How to get a flat stomach?

okay so its not so much that i want six packs i just want a flat stomach. So if i did enough crunches would i lose the fat on my stomach and get a flat tummy? i feel that if i made allot of crunches i would receive abs but they would be covered under a layer of fat. so here is my question, how can i lose that fat on my stomach? or if i work hard and do crunches do i lose that fat? im confused.

oh and i am 17 yrs, 5,6 and weigh 110 so im pretty skinny but have fat on my stomach and im really desperate to loose that.
Thanks so much!
also im just trying to lose weigh around my stomach… since im already pretty skinny and kinda have a history of an eating disorder my doctor would kill me if he saw that im cutting down on fatty foods.