Even if it were possible, I still would not prefer to have any kids.
First off, I haven't even been a "proper adult", and probably would never be. How can I be expected to raise a child with the care and love they deserve when I don't even have my life sorted out? Even if you argue that I'd have to change once having a child, I've also seen people fail to change even after having children they swore they loved even more than their own life.
Secondly, we've already got enough people that are unwanted and abandoned. Why not take better care of people we already have now?
Lastly, parenting is a huge commitment. It's not just about you and your "legacy", but another life that will suffer for your mistakes. For those who are up to the task and willingly take on the responsibility, thank you and best of luck!