Why do I like to eat so much?

I just REALLY like to eat. I am a 15 year old male, athletic, and with no plans for the summer (except for maybe working out), and I am gaining weight. I just really like to eat, and I am worried. I used to weigh 170 pounds (not fat, I'm just big), and now I am over 190 now. I'm not becoming "fat" yet, but my stomach is just big. I don't feel like I'm stuffing my face, but I just naturally eat alot. Like, if I don't reach for a snack or desert, then I just feel hungry. I used to starve my self a few years back, but I really really really don't want to result to that. The thought of it sickens me. Is there any way for my stomach to get back to it's normal size without depriving myself of food? Because it is just stretched out. And the even bigger question: why do I like to eat so much?