I'll never be a father. But when my friends and family members had children, I learned a new way of showing up for others.
I took the same decision a few years ago. Children are just not for me, and it's a lifestyle I don't think I can live. I have yet to figure out, though, if not having children is a selfish decision or if having them is one.
But the world needs uncles, and it needs aunts. And a lot of them. I don't believe two humans (and a bunch of random teachers) are enough to show a child how to live through this tumultuous mess we call life.
So far, my favourite way of raising a child is one I took from Aldous Huxley's Island: Every child in the community gets adopted by the neighbours who take over when the biological parents are overwhelmed, or the child needs saving from the neuroses of their parents.