Only eaten 270 calories?

Ok today I ate 3 granola bars(90 calories each). I burned 108 calories on wii fit, and I also swam for about an hour. Was this okay? Also, can I have some bean and cheese nachos or a baked potato and be okay? I trying to lose weight. I'm a vegetarian. I'm 5'1", 110 pounds, and going to seventh grade.