Before I started trying to lose weight I hardly ate, most of the time I would have one meal a day and I didn't feel as hungry as I do now. I'm eating 3 meals and 1-2 snacks a day, I feel satisfied right after I eat but a hour or so later and I'm starving again. I don't get it

Oh, and I'm drinking tons of water, nothing else.
Here's what I had yesterday, for an example.
breakfast- I know that's not much for breakfast but I can't eat more than that, hopefully once my body gets used to eating I'll be able to increase the amount.
2 scrambled eggs with onion, bell pepper and celery
lunch
whole wheat pita stuffed with a can of tuna, tomato, light mayo, spinach, onion and banana peppers.
dinner
turkey burger on a whole wheat bun, lettuce, tomato, onion, light mayo, and
oven baked fries
snacks
pretzel crisps
greek yogurt w/strawberries