So I've had this problem for awhile. I usually have several hours of it downloaded to my phone and when it gets old I feel the urge to download more. Sometimes I crave it to where it's hard to believe I've downloaded enough. Self pleasuring is also a problem, I'll watch it and self pleasure so...
Many people will encourage you to try to just cut it out of your life but just like any other addiction that won't usually end well and will just leave you frustrated and confused. The best thing that I could recommend would be to slowly cut it out of your life. Start with taking small intervals off at a time and slowly make those times larger until you are going weeks and months without it and eventually you won't even notice that you are no longer partaking in it. Many people don't understand the addiction but you should treat it just like any other one even though no substance is involved.
By keep watching
Sometimes it is necessary to masturbate to relieve sexual tension. However, watching porn can negatively affect the way you look at people. So you could try masturbating with your imagination (without the stimulus of porn). You could also try trading your addiction for another like a series on Netflix, trying new recipes, or working your muscles at the gym.