Organic Bagel Stomach Hurting?

Stomach Hurting? - organic bagel

Every morning, a balanced breakfast. I have one of these
* 1 cup of cereal and organic milk, 1 fruit
* 2 free milk waffles w / syrup, sugar, 1 fruit
* 1 Bio-Bagel, 1 fruit

And it satisfies me, every morning, about 10 points, my stomach starts to growl. My lunch at school is 11.40-12.10, so when I eat. Normally Pack
* Water, 1 PB sandwich, fruit and 2

Then, injured after lunch, my stomach for about 3 hours, then you stop to go to dance practice. It happens every day for 2 weeks ... What could that be?

I am a vegetarian 1 1 / 2 years and I am almost 16 years old.