OP, would you consider taking sex off the agenda altogether while you try and figure this out?
It sounds to me a mix of his sexual appetite for domination and yours to please him are becoming mixed with consent (and lack of) and poor communication are leading to some unhealthy, unsafe situations for you.
If you have a safe word but aren't comfortable enough to use it, then being in situations where you need a safe word isn't for you. That's not how it works. These situations are prime for the wrong person to bring abuse into a relationship and dress it up as a sexual kink, but that's not right.
For domination type situations, the dom should also be getting pleasure from your willing submission. I can't imagine you looking scared / uncomfortable and him honestly thinking that you're ok. He is using this dynamic to bully you I think.
Also; in Dom / sub relationships, communication is a huge part of it. You talk through what you want, how to make it happen, what your limits are, how to express your wants / needs during sex, any worries you have, how to approach them etc. There is no 'giving in' to keep someone happy. This isn't happening for you. He's pushing you and pushing you, knowing (as you have told him) that you felt unable to use your safe word.
Another issue here is the porn addiction. The problem there is that in a lot of the films, men start to do what they want, the women object then end up 'enjoying' it. If he's been watching that crap his entire sexual life, he may well believe that's normal and want that at home.
There is no set 'normal' when it comes to sex, but there are some basics that are required regardless of how you play out kinks. You must both be willing. You must both be prepared to call a halt if you need to, and to listen to the other if they want to stop. There should be no pressure to do anything, you should be able to talk openly and above all, you should be able to say "that is off limits" with no comeback, no testing of that boundary and no worry that it will cause an issue.
Can you honestly say that if you were in the middle of sex, you could confidently use your safe word and he would definitely stop? That he could kiss you forcefully and you could say that you don't want that? Because if you can't, that's a big problem.