I've read poll results stating that 20% of all Christian women are addicted to porn. So don't down yourself. 20% means 1 in 5. You're not alone.
I'd even suspect that Christian women are trying harder not to be addicted to porn or don't tell even in a poll, so I guess the actual percentage of women being addicted to porn is even higher.
But there is no reason to be ashamed of this anyway. It's just an odd cultural stigma that the depiction of naked (especially fornicating) humans is somehow a bad thing. There's no real reason for this.
From a biological point of view, sex is the answer to the question "Why are we here?" both in terms of origin and purpose. By fulfilling your sex drive you are just doing what you are
supposed to do. It's just that we still live in a sexually suppressive culture and get instilled tons of guilt for being who we are. Internet porn is just a way to unleash the built-up inner sex drive. It may seem enormous, but that's just a cultural thing. There's nothing wrong with you.
If you are looking for a "cure" (even though you are not actually sick), get more actual sex (that is: get your sexual pleasure without the shortcut to the web) and the problem should be solved.