When you and your friend are discussing the differences in your lives ("When childfree women talk to their friends who are moms about the differences in their lives, it can be a touchy subject"), perhaps you could both have a bit more respect for the fact that difference makes you different?

I'm sure every reader understands that? If your friend believes your life "revolves around selfish indulgences"; that without your saying so you must "dislike children or families"; that without your saying so you must have a problem with your marriage; and that you must feel empty, I have to question how close this friendship is. Do you actually talk? She doesn't seem to know how you feel! And she doesn't seem to think very highly of you. Time for a new friend.

I can assure you that it doesn't matter whether she has children or not - if she makes these assumptions, or even judgements, there's a problem in your relationship that has nothing whatsoever to do with the fact that she has kids and you do not. Unless this list isn't a real representation of how your friends speak to you?

I didn't have a child until after I was 40 and no one ever said anything like that to me.

Oh, and while I'm writing, I'll take this opportunity to point out that you haven't experienced questioning and criticism for your choices until you have a child. Of course, the possibility exists that humans just all constantly judge each other. If so, why not get used to it? It could be worse. Everyone could be telling you how to raise your child correctly!