How to lose 10 pounds of belly fat in one month?

I'm 16 years old 5"2 and I weigh 140 pounds. I've gained 10 pounds recently and I now have one of those round pooch bellys and I don't know why. I am very actiive and I work out everyday. I've been doing new work outs but they don't make me sweat or get tired. Please give me tips on what kind of workouts and what foods can help me lose belly fat and see some abbs. I don't want a huge six pack right now because I am still gorwing but I do want a lean slim body like other guys my age do. I'm tying to get back to 130 or maybe even 125. Please help Me and I will be so greatful.