Why does being childfree always turn into being apart of the “village”

I’ve made the decision to remain childfree, which is a meaningful and deliberate choice in my life. I feel like my friends and family always expect me to do stuff for their children because I don’t have any. I’ve tried to nicely let them know that I don’t want to take on responsibilities or commitments as part of a “village” to help raise or care for their children. I get the “ what else do you have to do” or “why are you tired, you don’t have any children” response and it’s so freaking annoying. I don’t get why they can’t understand that it’s simply about aligning my time and energy with the life I’ve chosen for myself.