Unless you actually have children, you will not know what you miss. Perhaps ignorance is bliss.
With holidays and childfree holidays, perhaps life is like one long summer. With children, you experience all 4 seasons in technicolour. Experiencing winter makes you appreciate summer more. And you get a rich harvest in autumn.
I speak as someone is was not maternal and is still not particularly maternal.
The earlier years were hard, but now I look forward to coming home to the dcs and asking their day, sharing a joke. I will be sad when they leave home but also grateful for my time back and look forward to their visits. One day they will get married and/or have children. Money was tight, we had to buy a bigger house, holidays were staycations. Now dh and I have advanced in our careers, we have nicer holidays and a big house that is bustling with activity. Every year is different.
You don't really know your dh until you have had children with him. Parenthood puts a lot of stress on a relationship but you appreciate what he is and he is your comrade in arms.
Parenthood is also a voyage of self-discovery. As a single person, you only really scratch the surface.
It is possible to be fulfilled without doing parenthood. You won't miss what you don't know.