DH and I tried for DC with a 'if it happens, it happens' attitude but then found fertility issues and we can't have kids.
I love my tidy, peaceful home, have lots of spare cash, and I have freedom and spontaneity with my days. I have hours of time to myself. I appreciate the fact I only worry about myself and DH, and feel relieved I don't have the 'mum stress' my friends describe, they seems to be constantly worrying about their DC and the world they have brought them into. On a really superficial level, having kids has very much aged my friends (lack of sleep and added stress I assume!).
We enjoy lovely holidays, sleep in at weekends, can take advantage of getting away during 'school time' for better deals (well, pre-covid!) And I have a lot of hobbies that I don't think I would have the energy for if I was a Mum. There are lots of positives in my life!
But. I know in years to come when I'm visiting friends and they're telling me about their now-adult DC and perhaps telling me about their grandchildren and big family meals and weddings and meet ups, I know I will feel a pang of sadness at what could have been, and exclusion of a club I will never belong to.
Whatever life you choose, there are sacrifices and you can't have it all, but you have to decide what regrets you can live with, and which you can't.