You have an addiction. It isn't a public addiction, like alcoholism. With alcoholism, the last person to know he is an alcoholic is the alcoholic.
Support groups exist for alcoholics.
If you go to Alcoholics Anonymous, people support you because they know you are seeking help. But you are addicted to pornography, and pornography addiction is a secret thing. You may be the only one who knows you are addicted. If you went to a support group for pornography addicts, and your friends found out, or if your spouse found out, they might be very disappointed in you. You might hurt feelings, break hearts.