Unfortunately most people are still stuck in the mindset that everyone who isn't broken inside wants children. I've never wanted children at any point in my life, but I'm wrong apparently.
Parents still push for grandkids, but that's different. Being a parent literally changes your brain chemically. My dad never said anything about grandkids, but after my daughter was born it was literally two years before he could have a conversation about something other than her. And he's one of those "interesting people" (traveled the world working on healthcare programs in the developing world) that has interesting things to talk about.
Everyone's different, but the right person can cause quite a bit of change in your life.
But in general sure; maybe OP has been to a lot of birthdays (as have I) where people stare at you like you just told you are a serial killer. While in reality you just don't want kids. That goes away when you go over 40 though. Then some people even start to envy you for your freedom. Generally better not care what other people think. It's a tiring and pointless thing.
Who cares at this point, just live your life, you owe nothing to "evolution".
But I'm guessing that even those people who don't want children are following the rules of natural selection. "Only the fittest will survive" is then translated to something like "only the genes of those who want to pass on their genomic data will survive".
[1] People have free will after all.
Disclaimer: I have no knowledge of the role of child-free individuals in our era of evolutionary adaptedness. I'm just pointing out that evolutionary dynamics are a lot more nuanced than "more children = good", especially in social animals.