First off, I want to say you’re not a terrible person. Like @ManekiNeko said, it’s normal to be curious. It’s also normal to want to try new things to distract you from your pain.
I have a different perspective. I’m doing a porn addiction recovery program right now. I started off viewing it occasionally out of curiosity, then over a number of years started using it to fill my loneliness and sexual frustration. I figured once I got married I wouldn’t need porn in my life anymore, but it had become such a comfortable part of my life that I couldn’t stop. The thing with it becoming a comfortable part of my life, though, was I didn’t think it was a problem and didn’t feel guilty about it. Then one day I took it a step farther by asking an old coworker for a nude photo, and I felt the punch of guilt you described. I knew I never wanted to feel that way again. I also knew that I had crossed a line I couldn’t return from, that I had turned a wild fantasy into a reality, and that I would do it again if I didn’t get help. I knew if that happened, eventually I wouldn’t feel the punch of guilt. Eventually it would feel normal. I knew I could not let that happen, so I started seeking help.
I’m not trying to scare you. I’m not saying you’ll go on to do something like that, or that you’ll wind up addicted to porn after doing this. What I am saying is you have a choice in what to do with your guilty feelings right now. You can let time pass, let the guilt fade, and move on with your life. If you do that, maybe you’ll remember how guilty you felt and not view porn again, or maybe you will, knowing what you’re about to see and how it’ll make you feel. Armed with that expectation, you will quickly stop feeling guilty about it. Or you could talk to a counselor or trusted mentor about it, and go into how you feel and what your concerns are. This is intensely uncomfortable, I know that for a fact, but someone like that may be able to help you process your feelings and pivot to other coping mechanisms.
The majority of people watch porn at least on occasion, so no one will think you’re disgusting for it. I think anyone worthwhile would think you’re brave and strong for trying to come clean about it. I know I really admire you just for posting about it here! Porn is a personal, private ordeal, something that’s both widely accepted and easy to keep secret, which makes it an appealing coping mechanism and also lends itself to fitting into a lifestyle. Most people don’t think twice about their porn habits. The fact that you are coming clean about it here, when you could just as easily keep it a secret, shows a lot of character and fortitude.
I am not a bad, disgusting person, even with as much of a hold as porn has on my life, so I can say with authority that you are not a bad, disgusting person. Porn is a taboo thing that drives people into secrecy and can make them feel alone and disgusting. Now pull “taboo” out of that statement, and porn is just a “thing.” It doesn’t define you. I’m proud of you for reaching out here. Don’t hesitate to do it again.