You should always eat a nutritious and well balanced diet. Breakfast like a queen, lunch like a princess and supper like a poor person. At your age, height and weight, it doesn't appear that you need to lose any weight.
First of all 13????? Why are you on a diet your body is still growing. Trying to be healthy is fine but you should not be trying to lose weight. Google bmi and see what is ideal body mass index for someone your age, if you still feel you need to continue to diet, always check with your doctor to make sure it's healthy.
Wait until your growth spurt. Please trust me, I know from experience. I hit mine one summer when I was a young teen. And I slimmed down quite a bit. But also I was A LOT heavier than you are now back then. But at your age I wouldn't worry about it at all.
For thirteen years old with 108 pounds and 5 inches and 4feet tall, dieting is not a viable option for you at this stage. What should be your focus at this stage is how to have balanced diet that includes all the food groups. When it comes to dieting you should reduce on the calories intake to your body.