Im a fourteen year old that wants to start weight lifting. I dont believe it will stunt my growth as long as I dont push myself. For the past month I have been doing 20 reps and 5 sets of bicep curls with 15 pound dumbbells. I have also been doing 5 reps of 3 sets of triceps exercises. Is this to much for myself if so what should I be doing to weight lift and not stunt my growth. Any help will be appreciated.