I am 13 and need to loose weight?

So my BMI is 18.009, and even though its in range by the looks of me I am not. I am 114 pounds, and 5'7". I have pudgy thighs and my belly's coming out a little. I don't know why but when summer comes I am eating more when i want to eat less. I don't know what to do I have tried workouts but my schedule gets in the way. What do I do?