Yes my husband was never getting married nor having children.
We met when I was 27 and he 29. My view was that you can't always predict what you might want in the future, Sonora good to keep talking, but it is important that you want the same things at the same time in life.
He proposed after 10 years, we got married and 2 years later had a baby. We were ready then having travelled and renovated a home, spent time on our hobbies, our careers, and done other things in life that mostly he thought you didn't do if you got married and had kids.
He thought marriage was pointless. I thought it was a celebration. He thought having kids would restrict life. I thought it would broaden and enhance it. It all boiled down to perspective and in his experience boys that became dads became boring stay at home, under the thumb blokes with no life of their own. My experience is that those who live like that is simply because they want to.
We still work as a team and aim for a balance of me time, us time, and family time.
It's not always perfect. He needs more 'me time' than I do, and that's ok. Neither of us forced the other into this situation, so commitment is really important, married or not, we chose this together.
If he has really strong reasons for not getting married, then you might need to believe him. If he's a bit airy fairy, try and understand more what his issues are with it.
And if you do believe him , whilst it's hard, have faith that he actually isn't the one for you, because the right one does want the same things at the same time. You are young and have plenty of time yet to find him x