Holy crap, you get full on 1,000 calories? I am a 14 year old girl, and I can wolf down over 3,000 in a day without blinking an eye. I had 1,200 calories for breakfast four hours ago, and am, in fact, about to eat a nice piece of chicken covered in olive oil. My stomach would implode if I ate that little, and you are quite nearly a foot taller then me (5'5).
Maybe I'm just weird.
If you aren't hungry, I wouldn't worry about it, though. Unless you have a thyroid problem, your body is good at telling you how much it needs, and I would just follow your hunger signals.