The priest exalted himself at your benefit by playing the role of an authority and a know-all while receiving a confession of an impressionable 12 year old boy. Your suffering of the past decade is a big fault of the priest. He cannot be held formally accountable for it, nor are you able to make him feel the pain he inflicted on you, but it is within your power to better your life going forward and to assume a protective, parental stance towards that scared 12 year old boy who was essentially bullied by an authority figure who did not deserve his trust. Some of the options for you: write a letter to the priest (and do send it if you know the contact info of the priest), telling him how hurt you were, how much pain he inflicted, how his desire to inflict emotional pain on a vulnerable preteen was a sign that he was not happy or satisfied in his own life, how disgusted you are with him, and how you are taking positive steps now to better your life, to enjoy masturbation, and to prepare for the time when you will be able to share your sexuality with an appreciative girlfriend (I agree that this time will come for you). You are a victim of the priest. The priest was the perpetrator of a crime against you, because he ruined your internal life for a decade. You need to take the situation in your control, abandon the idea that masturbation is harmful for you (you are already aware of it intellectually, but you need to believe it with all your being), welcome the progression from porn to wanting real intimate contact, and if you do all of those, you can look forward to a much improved life in the near future.