Hi thanks for your question.
Your 16 years old and masterbated 10 to 15 times.
Relax ,masterbation is not going to affect your health
Your height will not be affected.by masterbation
Symptoms like Collapsed cheecks and looking more older than your age are not caused by masterbation.
These symptoms are either in your brain or needs to be investigated
Yes frequent masterbation can cause low back pain
Relax and concentrate on your studies.
Hope I answered your question