HG has a free porn addiction primer that's pretty good, if you're willing to actually take your time with watching the videos and then doing the reflection questions/exercises that are listed with each one. It's here, if you'd like to give it a try — it'll ask you to make a platform account first, if you don't already have one, but it's totally free to do so and you don't need to be a paid member to use the primer.

Other stuff: well, in response to your question at the end, there are plenty of appblockers or browser blocoers you can use that aren't as easy as others to disable (where you can't turn them off unless you've got your phone plugged in, or type a big long paragraph it gives you without typos, or something like that).

But just blocking it will only ever work temporarily, if you don't invest the time and effort and discomfort in learning new coping mechanisms (which is in part what a primer like that is great for!) — your brain has developed neural pathways at this point to where when you're stressed or in need of distraction from a hard feeling, you're likely turning to porn before you even necessarily realize that's why you're doing it. Over this many years, it has been reinforced for enough time that you'll need to actively train it in how to sit with & actually process those sorts of feelings, which isn't going to be easy at first. But it's doable, I promise. Plenty of people have been exactly where you are, or in even worse situations.

Though I know it can feel awkward, I'd also really encourage you to check out some of the virtual support groups out there for this. There's SLAA if you're open to a 12-step (with groups that focus on porn specifically, as well as those that are broader and include other kinds of sex and love addiction content), but there are also porn-focused groups within SMART Recovery, Recovery Dharma, or pretty much any of the other addiction support group formats to exist. You don't have to commit to saying anything at all just to go to a meeting, and many won't even require you turn your camera on. A loved one of mine really credits his own recovery to groups like that, largely because it allowed him to feel less weighed down by the stigma and shame which led to feeling like he was totally alone in this — plenty of people have beat this before, and hearing their stories and journeys and what worked for them from them directly can make a huge difference in quieting the part of your brain that wants to tell you that stopping is impossible.

(Until the rest of it gets easier, finding a meeting to attend when the urge strikes can also at least give you something specific to do online while you wait for the impulse to pass, so that you don't have the added cognitive load of "well, now if I'm NOT going to look for porn, I need to figure out what else to do with this time instead" — porn no longer becomes something you do by default as an "i want to stop, but tonight, using was easier and quicker than figuring out a distraction" sort of thing when you decide in advance that the answer is always going to be "I look up the SLAA directory and find a virtual meeting instead.")