Keep living in your bubble my friend. It is not selfish to see the sacrifices required to raise children (and I will not enumerate them here, this thread is full of them if you want to educate yourself), see that all you get from society is "thoughts and prayers" (at least in WA state where I live) and take a hard pass on having children.
I... What?
This is literally the definition of selfish? You see what you must give up for the sake of someone else (children), see the lack of support you will receive, and decide that you don't want to make that exchange.
That's literally a selfish decision, because you are deciding you want to keep that energy and those resources for yourself.
It's not inherently bad to make that decision, but it absolutely is selfish.