How do i lose this belly fat? Im 15 and in wrestling. I need to cut the weight.?

I’m 15 and in high school wrestling, i have stubborn belly fat and little to no fat anywhere else i go to practice every day i do sit ups like crazy i don’t drink pop. My diet consists of 2 bananas for breakfast a sandwich and apple for lunch and protein shake for dinner. I need to cut this weight to get into the weight class i should be wrestling in but i just cant. I need advice.