Do you think people that are in their 30s and older are wasting their time not having children?

I have a cousin that had her first child at 43 and she got criticized for it. She said she waited too young and there’s a risk for having babies so late and she should have got laid in her 20s.
My older siblings has children. My brother had his first child at 25 and my sister had her first at 26. Of cousin different years.
I’m 21 and I’m getting pressured to find someone. I’m not ready to be a mom and I don’t want a relationship. I’m done with them.