I really need help! I know i just posted this but it is important?

I want to get in shape, im 110 lbs and 5 feet. I recently got in a fight and got my *** kicked i ran out of energy really quickly. Im going to Romania over the summer and im staying the 1 1/2 months, i have nothing to do so i figured i could try to get leaner and stronger. I'm 12 1/2. Since there is a limited amount of food we can get, I can't eat a lot even if i wanted to...