Creatine wont stunt your growth but itll to damage if you dont take it correctly (the proper amount at the proper times, with non-acidic foods/drinks, etc).
I think you should worry more about your training. Your biceps and triceps make up a very small part of your
upper body, and you are wasting your time by working them too often and only those muscles. You should focus alot more on your traps, delts, and chest, which are the three largest muscle groups in your upper body.
You should also do leg work, because it will benefit your upper body training in many ways and will also keep you from looking silly.
Dont work your arms more than once a week. Do arms one day, chest/back another, and legs on the third day. Thats all for now.
