Your 184 height should be athletic. Do you sit down after every exercise? This will make your ass bigger.

Sit less and stand more every day. Practice tightening the muscles on your ass and exercising your ass when you have time.

If thighs are not muscles, jogging for a few weeks should reduce fat. 15 years old and still growing. Dieting to lose weight is not recommended (although you are tall). Eat three meals a day to reduce oil intake, and eat at night to reduce the amount. Eat fruit when you are hungry.

Oh, by the way, doing sit-ups before going to bed at night can slim your waist. (This is obvious) You can also develop abdominal muscles after a long time.