May the peace of the Lord be with you.
My spiritual director told me something important. There are no such thing as coincidences. I believe there was a reason for you finding this site.
God has some plan for all of us. The problem is, of course, that from down here, we sometimes can't figure it out.
I know where you are coming from. I converted during 3rd grade and found school rather easy. Religion class was particularly easy. Some years were a blessing, but most of the time it was just "write down some BS and get an A." I dabbled in bad things: pornography, Eastern Religions, yoga, wicca/the occult, Communism. I was shocked out of it due to the death of a good friend. In addition to his faith through suffering, he told us that he could feel when people prayed for him. Said it was even better than morphine. That stuck with me.
You mention the term addiction in relation to pornography. Sadly, you are right. We are addicts, we must admit that. We also must realize that we will never be fully impenetrable to temptation. It could be the littlest trigger or just loneliness. We are not alone, the specter of pornography and self abuse haunts far too many these days. I found out about a man who has lived with the addiction, fought the fight, and with God's help has proven victorious. He has now dedicated his life to helping others. It is a good source of information and the forums offer personal contact with others who are going through the same thing to help you through. His site is:
http://www.trueknights.org/
Satan's traps are out there. However, we must first do two things. First, recognize that the past is done with, we cannot change it. Secondly, in the words of Jesus "For human beings it is impossible, but not for God. All things are possible for God." (Mark 10:27) We must realize that we will never get anywhere going it alone. We must accept the Graces that God offers to us.
It is a struggle. I'm not going to sugar coat it. I've greatly improved in the last four years with the way my life is going. I still fall on occasion. Some months or weeks are worse than others. But I know God has a plan for me and that He's going to give me what I need to get there, I just have to take him up on the offer.
Remember, Jesus says further down the same chapter of Mark.
"Amen, I say to you, there is no one who has given up house or brothers or sisters or mother or father or children or lands for my sake and for the sake of the gospel who will not receive a hundred times more now in this present age: houses and brothers and sisters and mothers and children and lands, with persecutions, and eternal life in the age to come." (Mark 10:29-30)
It's worth it...
Feel free to contact me if you are in need of any help.
Pax,
Brian