Focus on being ‘selfish’ now and selfless later.
From Lauren Peacock, author of Female. Likes Cheese. Comes with Dog.: Stories About Divorce, Dating, and Saying “I Do”:
I am choosing to be selfish now so that I can be selfless later. Choosing my career now and working towards these goals are things that I want for myself. When you throw kids into the mix, your life is supposed to revolve around them. That isn’t a bad thing, that is just the realistic way the world works (or should work, at least) when kids come into the picture.
Full article here: https://lifehacker.com/what-to-say-when-someone-asks-why-you-dont-have-kids-1845714332