I could better answer this question if I knew your age. While there is nothing wrong with masturbating I'm sure you don't want to go to you dad and say your penis hurts after masturbating and you need to see a doctor.
Depending on how old you are you may be old enough, under a Federal Law, which would allow you to seek a doctors help for this as your penis is part of your reproductive system. By this law if you are old enough you can seek help from a doctor for any reproductive system concerns without parental consent or knowledge with total confidentiality.
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