I have a overeating problem and i'm trying to find a way to stop it so i can loose weight,any advice?

I'm 17, 5'5 and im guessing i weigh around 170 something, i dont look fat or anything but i do have love handles and huge thighs due to never exercising, i do realize im not healthy and i want to change that this summer, i've come to realize i have a bad over eating problem,like i'll eat and i wont be full but i'll be satisfied then after a while i'll go looking for more food to eat even though i know i'm not hungry, its like i need to keep my mouth occupied or something, i was thinking about buying lots of gum,so instead of over eating i can just pop in some gum till i'm hungry. Any advice?