Why can't I stop eating too much?

Start damn exercising. You're not even eating that much. I mean, damn, I eat like 2500-2800 calories a day and I stay at a constant 180, I'm 6'3". And you know what? I don't even exercise as often as you would think. I'm a marine, and all I do is every other morning do some wind sprints and go to the gym every day but sunday. This isnt hard.