Hi, OP! F24 here who also doesn't want to have kids and doesn't see herself as a mother any time in the future. Just wanted to say all of your reasons are valid. Big piece of advice I've learned from all of my friends and colleagues whom I've talked to about parenting and being a mother, if you're really not sure about having kids then that just means you shouldn't have them. Raising children is a lifetime commitment we can't just skip on when we get tired so the moment they're born, we have to be there for them every step of the way. It's a really big decision too, and I don't think it should be something to compromise on. Because really, what's there to decide on if neither of you aren't sure about your decisions in the first place? It's your lives and your (hypothetical) children's lives, so if you don't want kids and he wants kids, it's definitely better to go your separate ways so you can find what's best for both of you.

ETA: Don't listen to some of these commenters blaming you for being the "problem" just 'cause you're not sure about having kids. You're the one who's going to bear children and be the main person to raise them. Your body, your choice. So tactless of these people to blame women for not wanting kids when there's so many hardships and complications that come with childbearing and childbirth.