If you are still young and want to lose weight, more exercise is still the most rustic way. For thighs and stomach, the best exercise should be running and skipping rope. You can spare some time to do some regular exercise every day, and play basketball and football in your spare time. Boys should sweat more and exercise more. I believe they will achieve something after a period of time.

Eat reasonably, don't go hungry just because you lose weight, boys are still growing and developing at this age! Eat more vegetables and lean meat, drink more soy milk, and eat some fruits, fish, shrimp, bone soup and so on every day.

In fact, you are not fat. As long as you exercise well and sleep well, your meat will become strong, so your figure will be much more symmetrical.

Wish you success!