proper terms?

As soon as they corrected me, I became one of them.. I knew the difference between a squash and a pumpkin… so there I was, correcting other people that made the same mistake, mistaking squash for a pumpkin. With the same surprise in my face.. as if I have always known the difference myself..  I was as appalled.. then disturbed later when I watched myself.. the time between not knowing and knowing is so long.. as if in a different era.. how did I live before I knew?