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Whats the average size penis for 17 year old?

I am 17 years old but have recenty found out that my bone age is of somebody who is 14.5 years old. This has effected my height (i am 5 ft 4) and my penis size. I have 'crohns'

I am 4 inches errect with a girth of just under 4 inches. I am on human growth hormone now to get the most out of my growing. Will my penis continue to grow? Is this size normal?

thanks