If you don't want kids, then just don't have them. It's all good.
Visiting Paris again but with a toddler this time, I grew to enjoy it more than I ever thought possible. Reliving the experience through her eyes was unexpectedly fun. There are other hobbies and interests where this emerges as well.
I actually got bored of solo traveling as I felt there was a point of diminishing returns. Having a family is a way to experience it all anew again.