hey....
kudos to you for owning up and recognizing the problem.... that's a big first step and gets you a start.
My biggest struggle in addictive life has been alcohol. But, I had a good 2 year run with coke myself and it was a fast and slippery slope. I've admittedly had my share of addictive behavior with pornography at certain stages of life as well. It never really got its hooks into me the way alcohol or cocaine did.... but I can see how it can and would. Also, there's a direct relationship, in my experience, between the drug and the sexual outlet-seeking.
I didn't personally use NA or any sort of counseling to get away from it. In my case I could see where coke was heading and then I ran headlong into catastrophic life events with divorce and a change was kind of forced on me. I looked at what was going on in my life and realized - crap - I have to change this.... in my case, I also wound up moving away (to another country where it turned out coke was very difficult to obtain even if you wanted it). So, I had some help in that regard.... and my addictions turned to alcohol for the long slide.
In any case, my suggestion is that if you really see this problem and you really want to change your life for the better - then start taking action. Delete ALL of your dealers' contact info. In fact, get a new phone number yourself. They will come to YOU if you don't. That's their business. Stop hanging out with people who do coke. Stop putting yourself in using positions. Find a counselor to augment your NA attendance with. Get honest about your addictions.
You will find that as you get away from the drug, and get talking and get honest and get making changes - your desire for it will diminish. It's also likely that your obsession with pornography will lessen or be alleviated by working on yourself and by getting clean and sober.
These things are causing trouble for you - and if you're like the rest of us addicted folks, it will only get worse until you choose another path and make it better.