A childhood belief about weeing and pooing

Even though my parents almost never took any of the family to church, I was still raised in a very sheltered and puritanical environment. My only sister was years older than me and therefore able to hide knowledge from me. Perhaps she told me that that "girls don't poop" as I see numerous others on this site have been told, at an age when I was too young to retain a specific memory of it. But even if the memory wasn't tangible of it's origin, I too certainly got the idea that girls don't poop. Believe it or not, that was a belieef I never questioned until high school, and never got any clarity about for quite some years thereafter. One day in my first year in high school I heard some sarcastic boys that I didn't much trust telling a story that mentioned a girl "shitting". Perplexed, I couldn't help but ask something about that, to the effect that "girls don't do that, do they?" (I don't remember my exact words.) In any events, the responses I got mainly made me regret asking, consisting mostly of derisive laughter and ridiculing. One guy did tell me that girls poop just the same as boys do, but there was no clear indicarion but what he was being as derisive as the rest. I wondered, after all, do boys really know for sure? I was finding that I apparently didn't. I started thinking how nice it would be if I could find out from some girl that I could trust. The only girl I could imagine daring ask was a very nice, but very popular "upperclasssman". I more or less had a hopeless "crush" on this girl. I decided if I could just get her to enlighten me about this matter, I could be more content and make my joy of know her everything that it possibly could be. I didn't dare start out askig her, "Hey Kathy, is it true what I just heard, that girls poop exactly the same as boys do?" So, to break the ice, I started out telling her that I'd always heard that boys and girls "go to the bathroom" differently, and I understood how they pee differently, so she need not try to explain THAT. At that point she gave a resounding response of "Yeah, Wayne, Girls are different! NO SHIT!". That was in a tone as if to end all argument about it, so it seemed, and that stopped me dead in my tracks. Having no previous knowledge of "No shit" as a figurative expression, I could only think she'd confirmed what I'd assumed for years. So I could only go on believing more of the same. Only years later did I begin to piece together with her response what I'd grown to understand of the figurative meaning of "No shit!", understanding at last that Kathy might have had only the best intentions of setting things straight for me and that I might have had a chance back then of continuing the inquiry and learning the truth from her, if only I had understood what she was meaning by "No shit!"