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Testosterone and Masturbation as a teen

Hi I am a Teen 14 years old. Firstly is Masturbation alright Like I know Porn is toxic but is masturbation bad to do in a frequency of maybe 1 time every 2-4 days. Secondly as A growing boy into a man how do I know my Testosterone is intact as I am going to be real I am really insecure about the fact many morning I don’t have a hard morning erection is this something I should be worried about. Although for maybe 2-3 days in a week I do wake up brick hard , how can I keep my testosterone high and healthy as a teen. Thanks for your time and just one more thing.

Is 6 inches a good size erect and is there a good chance my penis will still grow . This is just a sub question not main question feel free to not answer and just answer my initial questions.