A lot if you seem tobe forgetting the OP is 16. Maybe still going through puberty. Cut out the refined stuff. Get more activity. Figure out the habits you can keep up with for life. Also, you can’t fight genetics. It may take longer for you to lose around your midsection if that is where your body stores weight. Strength training is your friend, and will help you boost metabolism. Most important is find activity you enjoy and keep at it.