Most parents want everything to cater to their family... you say. This irritates you.

However, you find it irritating when people call you selfish when things are catered for you.

Who are these people calling you selfish by the way? Who has said your selfish for not having kids for example.

This frustration with parents seem to come from a sense of guilt? Not that I agree you should feel that way. But all this talk of feeling selfish and being called selfish. I have never felt that way about any friends or family I know without kids. Never even crossed my mind.

If you're truly happy with your lifestyle choice, these things shouldn't bother you at all.

So many weird assumptions here.

How exactly is everything optimised with families in mind? Ask any parent and I'm sure they will tell you how unoptimised their life is.

Why does a single person with their own expendable income worry so much about being catered for specifically? Your only responsibility is to yourself. Do you look around and bemoan family specific services? It's such an odd thing to care about unless you had a grudge.

Kids aren't a 'lifestyle choice' like deciding to travel. Do I need to go into the reasons why kids are important or who will be paying to keep you alive when your older?

People had to tolerate your existence when your parents decided to bring you into this world. Why not show the same courtesy?