I'm so glad that you've made the decision that you have to talk with them, Faust.
It's not easy. I'm the first to admit that, as I've had to do the same thing. I'll give an example of something more recent that I was terrified to talk to my parents about, quite possibly in the same sort of terror that you're in right now.
There's been something God's placed on my heart for some time (since the middle of October) and since the end of November, I felt like I needed to tell my parents about. But I was afraid how they might handle the news. I know they've been stressed with work and generally busy and I was scared that I was just going to "get in the way."
I talked with my dean of students about it (she's like a counselor to me) and she kind of gave me the ultimatum that while on break, I would
share my news with them with the same sort of vigor, passion, and excitement I had been with her, and then upon coming back to school I would then report to her how it all went.
So I did. During my first week of break I shared my news with my dad and stepmom. It went over very well, and they told me that if I needed any help when discussing with my mom, they would be there for me. They, like my core accountability group and my brother, are in support of me in this new path God's leading me down. I'd been dancing around the issue with my mom for close to two weeks before she mentioned something to me in church which made me realize that I had to have that talk. So that night, I shared my news. At the end, she, too, was in support.
This path that God's leading me down ties directly to my recovery from my issues with lust. So even though I am months-years removed (depending on what issue we zoom in on) I am still dealing with my recovery. That being said, you are not alone. It's difficult, but you're not the only one dealing with hard talks and discussions with parentals.
When you talk with them, discuss how you want to be free, how you want to heal from the wounds and scars that porn has left you with. That's what I see when I look into your words, a guy who struggles and wants to be released from the chains and burdens.
I think that showing yourself vulnerable, but ready to move on, the way that you are here, will make all the difference. They might be confused and upset (my parents were when I first came clean) but I'm sure they will also be understanding to the issue, and want to be a part of your recovery and helping you where you need it.
At any rate, God is with you and will be with you once you decide to move. You know it's what you need to do, now you just have to make the time to do it. I'll be praying! Godspeed, brother.