There is nothing inherently wrong about watching strangers having sex on a screen. However, that's not what a lot of porn is. There are exceptions of course, such as ethical porn and the 'joy of sex' type, but a lot of porn objectifies women and exploits them, with some forms of porn being nothing more than a cinematic presentation of violence against women despite the faked groans of pleasure.
If you want to watch porn, that's fine, like I say, it's just naked bodies on screen participating in a perfectly normal human behaviour. But - and it's a big but - ask yourself why people want to do that on screen for other people's viewing pleasure. Do you honestly believe that ALL the participants are doing it because they get a kick out of it? Because if you do you're living in wilful denial. Figures put the number of women in porn who have been trafficked, exploited, coerced, or forced through sheer desperation, at about 75%.
If you want to watch porn, make the effort to find out more about the industry and source the stuff that has been made by willing participants. It is out there but you'll have to look for it. If you can't be bothered, that's fine but you should be aware that you are wilfully contributing to an industry that exploits and harms.
OP, your feelings here are valid. There is lots of evidence to show that porn affects men's relationships with women. This depends a lot on what is watched, how often it's watched, and the context in which it is watched. Porn can rejuvenate some couples' sex lives and it has a place. But suffice it to say that a man who consistently prefers to watch porn rather than enjoy real sex with his partner has a problem. Hardcore porn in particular has been linked to an increase in violence towards women because it encourages the viewer to see women as a receptacle, not quite fully human and whose sole purpose is to pleasure men. Given that your partner is expecting you to behave like a porn star, I'd say he's watching too much and it's not the right stuff. And he's certainly not considering your feelings in all this.
I think the only solution to this is discussion. Get him to think about the industry and why contributing to the rape and exploitation of women is deeply, deeply unsexy. If he's a decent human being, he will be sickened and want to switch to porn that he knows has been produced without that background. Tell him that you feel cheapened by his porn-star approach to sex and that you feel it demeans you as a woman. Point out that most porn isn't a realistic representation of normal, loving sex so why would he want to have sex that makes you feel hurt, demeaned and exploited? That's not the actions of a loving partner. You could also - if you are up for it - try making your own porn films, but I wouldn't advise that until you've got some way towards resolving this already, as I think it would be more than likely to make you feel cheap if you did it too soon.
Hope you find a happy resolution.