Your whole reason for being, the thing that gets you out of bed and searching for food, is your in-built desire to recreate and nurture life. Intentionally rejecting that is a massive commitment to make, given the very long term consequences of it.

In short, go have some kids, bring them up well and enjoy the benefits. Our biology is tribe-based and ingrained, so it's smart to work with that and be part of a tribe.

We all die alone, but those that die surrounded by love feel less lonely in all the decades up to that final point. That's your Dna rewarding you for a job well done.