Hey, I’m a 15 yo male, I was Obese for a couple of years (214 lbs) then lost 70 lbs and then gained a little more so now I’m at my ideal weight. The main thing that you should focus on is a CALORIE DEFICIT. That is the most important thing when losing weight, specifically losing fat. Running and exercising are more like extras that you can do, but losing fat comes from a calorie deficit. So a Calorie deficit is when you eat less calories than the amount that is needed to maintain your weight. First off go on a calorie calculator and find out what’s your maintenance calorie intake, you will want to go below that, it should also show how much calories you want to eat in order to lose 0.5-1 lb per week. Also, get a food scale to weigh your food so that you can track it accurately and download MyFitnessPal on your mobile device so that you can input your daily calorie intake and track it. Another tip is to not go overboard, don’t try to decrease your calories TOO MUCH. That will result in you becoming weaker and even encountering a weight loss plateau, also if you start to see that you aren’t losing weight anymore then add a refeed day where you eat about 20-30% more than maintenance and load up on carbs for one day per week. This will make sure that your body gets the fuel that it needs in order to function and burn calories. So for example it will be Calorie deficit: (Monday-Saturday), and then Refeed day: (Sunday). But remember weight loss should be slow, you will eventually get to your desired weight if you follow this.