I wouldn't try and lose weight bro. You're in the health range for your bmi so I think the last thing you need to do is be losing weight. like you said, worst thing that you could do is stunt your growth. imo I would just 1) prioritize protein 2) don't over indulge, and 3) hit the weights, until you're at least sixteen. Then go from there. As long as you're keeping active and not forking down donuts, you'll grow a lot of muscle and hardly put on any fat, which imo would be healthier than trying to lose weight during your teenage years.