That's barely a reason why. The main reasons we didn't have kids are as follows:

1) Broke. We didn't have money. We were stuck working shitty jobs for shitty pay, which meant we didn't have money to go out and socialize to find a partner, let alone have the money for diapers, formula, daycare, and everything else associated with a child.

2) Why be a parent when our own parents were so uninterested? I most likely didn't have that "biological clock" because my parents didn't care about my hobbies and interests. I've been raising myself, even as the youngest child of 8. How would I know the joys of parenthood when my parents only cared about the TV and phone while calling all my hobbies a "Nintendo" and leaving me able to count the number of times they played with me on a single hand. Two camping trips a summer, almost no vacations, and being forced to go hunting and fishing with my father who was trying to "make a man" out of me (and failed miserably because of biology; trans). The rest of the time, my parents spent living in their own bubbles.

3) Stopping the cycle of abuse. For many of us, too, it's also about ending the cycle of abuse. Rewind 10 years and there was no way I would have been mentally able to take care of a child without beating on them. My anger was out of control, and I was fighting to unlearn to react to anger with rage and violence. That's because when I was little, I was beaten, and I knew I would beat my own kids, too. Yeah, I wouldn't have been like my mother who beat me all because a book fell out of my hand and it startled her, but I would have probably lost it over something stupid, like waking me up in the middle of the night. It's a much different story now that I've had therapy and worked through all that, but I didn't want to pass that traumatic history of abuse and my short temper onto a child.