Hm am I allowed to answer? I did IVF with a previous partner and it didn't work. It might have - would probably have worked - if we'd kept going, or considered donor eggs or sperm or we could of course considered adoption.
I however decided I didn't want to become a mother at any cost and felt like I actively then chose to not pursue motherhood at that point.
I broke up with my DP and could of course pursue solo parenthood.
For me it's as much about the ethics and morals of doing that (I would never use donor sperm etc) as much as simply choosing a different path in life.
So I don't feel I am childless not by choice, but now at this point I am childfree partly by choice.
I decided after a lot of IVF and a strained relationship with my DP that in my 40s I didn't have what I would have wanted in myself to mother. I felt I could find other ways to be maternal if I chose. I have a job with purpose and do volunteering to add a bit of meaning to my life. And lots of fun and hobbies and interests. Lots of friend many of whom are childfree.
I didn't feel having a child was the be all and end all.
So I suppose I have decided not to have children because the path to do so would now likely to be long, arduous, painful, financially expensive... And I have a lovely life. I don't want to waste it on years of potential misery to ultimately not get what I want when I can actively pursue happiness and other things instead.
Not sure if that helps!