It's rather a moot point in my case, given that I'm about to turn 50. Even if I wanted kids (which I don't) I wouldn't start a family at that age. I don't want to get married, and I don't even particularly like children, so becoming a father wouldn't be a very responsible thing to do, would it?
There has always been, and will always be, a fraction of the American population who choose not to have children. In spite of this, the projected population of the US in 2050 is 439 million (compared to today's 310 million). It doesn't seem that my choosing only to raise a Husky is having too much of an impact!
You rationalize things well.
Stick around and educate yourself. When Aisha in her headscarf or Maria who speaks no English is taking care of you in your old age, your decision may look different.