Children are the greatest gift. In my opinion your life is very empty, full of materialism and selfishness. On your deathbed you will look back and wonder what it was all about, and no one will be there with you.
That’s a heck of a baseless assumption IMO. I’m not the OP, but I am in a similar position to them - in my case I have a sufficient amount of material stuff to be basically comfortable without excess; then beyond that I have friends, volunteering at community events, and working on open source projects, none of which feel particularly materialistic or selfish?
I too have had a rewarding career that has afforded me all kinds of comfort. I've traveled extensively, even living in a foreign country. I've met interesting people and done interesting things.
But there's something special about hearing your child say "dada" or "mama" for the first time.
Notice, though, I said "fulfillment" and not "happiness"; I find the lows are lower and the highs are higher.
I wouldn't call you "selfish" or "materialistic."
I would say that parenting requires sacrifices--time, most of all--and can cultivate a kind of de facto anti-materialism depending on the parenting style.
There's a reflection on the past where you think of yourself as less selfish now, since you are now locked into doing more for others. Never before did you have to suck snot out of the nose of a completely helpless being, clean human waste, or endure having your beard roughly tugged on because it got a giggle.
The childless thus can _feel_ "selfish" to parents since they typically don't do as much for others as parents do for their children / wives / husbands / etc.
But that doesn't make it so.
I've faced all these (disability from a young age even) and as a result, I don't think there's any way I could raise children. Both because of my own issues make it seem challenging beyond possibility, but also because I wouldn't want to force a child to face the same problems I did. I very much believe to each their own on this particular subject, but if global fertility is "collapsing", then it seems like more people are coming to the same conclusion for one reason or another.
My point about being comfy, was the OP's self description of a blessed, wealthy, pain-free life. But this state of things is temporary, so to be sure one has the mental, emotional, and spiritual tools to accept life when one isn't living a comfy existence. The description of having kids, and of life itself being meaningless, is a signal that when life throws the OP a tragedy, the response will not be healthy.
Yes, I agree with you that you have to create some meaning in your life, make up something and convince yourself to believe in it, because there is hardly another option.