AIO? I (20F) and my boyfriend (21M) are not on the same page.

I really just need advice from someone who has a bit more life experience.

My boyfriend and I have been together since we were 16 and 17, I have made it very clear that I eventually do want kids and would like to be married at some point in my 20s. He had talked about it with me all the time but now that its is actually here and it really is time to start thinking about our future I feel as if he is not on the same page as I am. Yes, I have talked to him about it but now the conversation always goes to “you can’t put a timeframe on these things” I disagree with that, and I’ve told him I disagree with it. I told him that if he doesn’t want the same things I do that’s completely fine, marriage and kids aren’t for everyone. However I told him that if he doesn’t want it to let me know because then we would never work out in the long run. I don’t want to waste my time with someone who doesn’t want the same things I do.

I am simply asking for advice on what I should do.