I think most people have a good sense of whether or not they want kids or not, and you have to be true to that.
I agree. I would never guilt or shame anybody for deciding they didn't want to have kids..
By the same token I would hate for somebody to miss out on the total joy it can bring just because they were a little uncomfortable or scared.... because in the vast majority of people that goes away quickly once you have your own... Heck, I always wanted kids but when it happened, I was scared to death.
I hit that, scared to death, feeling long before reaching an age where I would wish to add to the species. I blame my older sister, Pam. I was a typical teenager in the 70's, long hair at 14, and my sister who was 19, we looked just alike, well to her baby that is. The kid couldn't tell us apart and was quite comfortable with me. Thank goodness she wasn't breast feeding.

Anyway, she asked me to watch her son of 8 months for about 45 minutes while she ran some errands. I'd never done that before, but the kid liked me and after-all, how hard could it be? 4 hours later, I'd found out how hard it was and I was steaming mad at her for making me scared to death. That was it. Babies were out of the picture for me. I never put myself in a situation where I'd be around kids again. They'd show up, I'd leave. Never held another baby.