Kids and marriage

So for as long as I can remember, I’ve never wanted kids or marriage. I’m more than happy to be in a relationship and have sex etc but just don’t want anything more. I’m not scared of commitment or anything, it just doesn’t interest me….

Sadly my boyfriend wants kids and maybe marriage and try’s to change my mind all the time about it.

My question is How can you move on in a relationship if you both want different things?

I love him dearly but we want different things which makes it hard.