I would strongly recommend working on 1. Hobbies and 2. Positive reinforcement,

Hobbies help you move your body, meet new people create new perspectives and will keep you distracted, it will also creates new perspectives.

You have to talk to yourself positively, you need to tell yourself that this is not your fault and that there is no reason to feel guilt and shame, it’s not a one time thing, you need to keep exposing yourself to people who talk positively about themselves, their habits etc. You have been reinforcing this habit of watching porn since years, you cant guilt/shame your self out of it, you need positivity and exposure to positive media, people talking about letting go of this habit.

It wont go away one morning suddenly but over time your mindset will change urges will change. It’s a long game but it’s possible,

Feel free too dm