Brief Answer:
Masturbation has no ill effects on any organ.
Detailed Answer:
Hello
Thanks for your query ,based on the facts that you have posted it appears that you have been indulged in masturbation since many years and now worried about getting cancer of prostate in future.
First of all there is myth in a mind of common man that excessive masturbation is the reason of all sexual problems But I would like to state that it has been discussed in scientific forums all over the world and proved scientifically that masturbation does not have any negative effect on any organ or system in the body .All the problems that you are facing now are mind related and due to anxiety.
Though it is harmless, excessive and frequent habitual masturbation does affect quality of erection and delays ejaculation .Please try to reduce the frequency of masturbation by keeping yourself busy in activities like sports ,reading ,social work etc so that you will not get free time to masturbate.
Hope I have answered your query ,please feel free to ask if you have more questions , I shall be happy to help you .
Thanks and Regards.
Dr.Patil.