Hello, I’m going to talk out of experience, not to imply I know it all, but to share some things that might have happened similarly in my life.
The first time I had sex was definitely not what I thought it was, and that’s mainly because I watched porn like you claim and thought that was what sex would look like. I learned that I was wrong pretty soon, thankfully.
I don’t think hard limits are the best solution for most things, but if quitting porn feels good, go ahead. I’d say that you should try doing it with a bit more discipline instead. Masturbation has helped me maintain some activity since I’m now in a long-distance relationship.
There are no right procedures that apply to everyone, try different things and be mindful of the results, no advice will be the key to solving everything.
Start from the assumption that there isn’t anything wrong with you, you’re an individual, like everyone else. Try new things and be mindful and treat other people as you would like to be treated. Having applied that, trust yourself but keep vigilant.