The best way that I have heard of to overcome this problem is to start with a Christian accountability partner. Someone who understands and can be there and talk to you when the temptation arises. I've said this many times before, but God wants you to let people into your life who can help.
Our church has a men's group to deal with this problem. It was started by a few individuals, and it ministers to many men. Then you need to put child controls on your computer, so you simply cannot access these sites on the internet.
And most important, you do need to dig into the Bible, and prayer. But, don't end up feeling like you have failed God when you cannot resist, but rather talk to your accountability partner, and get them to pray with you. A mentor would also help, but you have to be open and trust them.
This is sadly a very big issue in our society. It is something that does not happen in our homes partly because we are older and porn was always seen as a huge and disgusting obscenity, and my husband never even looked at this kind of smut. But also, because we have always trusted God in our marriage and in our lives.
I do agree that your wife needs to know. But you need to be in the overcoming stage, and have made considerable progress. Praying you find someone or a team to help you overcome this addiction.
PS It is an addiction, because it changes the pleasure responses in the brain, and makes it so you need it in your life. That may mean going through withdrawal, because I do believe cold turkey is the way to go. Why keep feeding this addiction, maybe less, but still doing it. Get a program together of when the child controls go on your computer, when you are going to meet regularly with an accountability partner and get started! It can be overcome!