Welcome to HCM
We understand your concerns
I went through your description. I suggest you not to worry much. The dull pain you are mentioning or feeling in your testicle could be due to non release of semen through masturbation
. There could be other reasons also. To confirm you must visit a general physician who could give you correct diagnosis, correct advice and medication. He will be able to see the actual penis and prescribe medication. till then stop worrying. Because worrying unnecessarily can be emotianally dangerous.
Hope this answers your query. Available for further clarifications.