having kids is the baseline normal for millions of years. As much as you "feel" that this is the most important thing you ever did, it is worth taking a step back and think rationally about this. Is it really? What about it makes it SO important? Because we for sure are not going extinct at all. Having a lot of kids has always been the default. If you don't have kids the world will be absolutely fine, in fact nothing will change at all.
So you should ask yourself. Why is it the most meaningful thing you ever did? Because it is YOUR DNA? Isn't that then a completely self-centered pursuit?