Im around your age, and for a while a was lifting weights and using a machine. I've actually heard that this can stunt your growth if you are younger if not done properly but, I'm not sure if its true but, anyways I found that I didn't get great results from it. Then when I started high school sports, and we didn't really use weights, we did more running, certain excercises like situps, pushups, jump roping, lunges, etc and of course the actual sport. I found with those kinds of things I got way better results. I felt stronger, I lost weight, I was more toned, and I felt better and looked better. I would recommend do some cardio (jump rope, run a little, etc) and do some different strength excercises, and do an activity. It could be something like just playing basketball or tennis with your friends for fun or rollerblading, ride a bike, even dancing.
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