How Do You Lose Belly Fat Without Buying Or Dieting ?

I`m 106 pounds and I`m only 10.I want to lose fat and also want to lose alot of belly fat.I dont want to buy stuff or go to a special place or not eating alot.I only eat breakfast a little snack a lunch (sometimes) and supper I eat whatever my mom makes.And I dont know what kind of exercise I should do or anything.Please , Please , Please HELP !!!!