help with some real talk! my bf wants kids but i dont, are we wasting eachothers time?

I've been with my boyfriend for 5 years, we we're best friends before that for 2 years. (I'm 26 he is 27) I love this guy but I don't want kids, I am irresponsible and not ready at all and I could list a million more reasons why I don't want kids. (I love other people's kids I just don't want any of my own) I suppose maybe when I'm 35 or something I would consider adoption if I had my shit together.

anyway, my boyfriend really wants kids, not right now, but some day. I have told him, even before we were dating I didn't think I wanted kids of my own. I love him and I would never ask him to abandon his dream of being a father, if we couldn't work out because he wanted a family I would totally understand and wish him the best. He has it set in his mind that he wants a family only with me.

That's sweet an all but I don't want to just have a child simply because my BF picked me to be the mommy so, there that has to be my life now. Obviously if I had that mindset about it, it would be bad for a child.

The other day his friend was hanging out and my boyfriend said "yeah I honestly don't know why we stay together, she doesn't want kids." So of course I say "woah man, do you really feel that way?" And he says "yeah kinda"

So obviously this is causing problems, I'm not going to ask him to not want to be a dad but I also want him to respect that I don't want to be a mom. I feel like this might be a dead end and possibly something he will regret for the rest of his life if he stays with me. Now I feel like I'm wasting his time. I know I have to sit down with him and have a serious possibly relationship ending conversation about this, any advice how to go about it? Any thoughts?