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Depends on whether or not you can do them with good form/technique. Given that you seem to lack a coach, it might be advisable to post a couple of videos for technical feedback.
Stunting growth is not the issue. Essentials of Strength and Conditioning indicates the the optimum time to begin strength training is two years after their PHV (Peak Height Velocity) for males, while females can begin during their PHV cycle. Most sports do offer Long Term Athlete Development guidlines for coaches and trainers and most of these LTAD documents suggest focusing on technique, balance, speed, and coordination at younger ages.