Your boyfriend’s selfish position pisses me off, and he’s not even my boyfriend!
To some extent, I could maybe, possibly see his point, IF you actually wanted children. But you’ve said that you don’t. So that shouldn’t even be a question any longer. The fact that he’s still using that as a reason shows me that he doesn’t respect how you feel.
Your body, your rules. Period.
Beyond that, you’re going to age anyway, at some point. Did he think you would always be young?
I’m sorry that you’re going through this, but it really sounds like you made the absolute best decision. If he decides to get his head out of his ass, cool. If not, eh, he’s being a dick.