There's probably a word I've been pronouncing wrong my whole life that I don't know about
Just based on how often I notice someone mispronounce a word without realizing it (or have done so myself and realized it later). Statistically I'm probably still doing it with some word.
I don't know if this is weird, but someone told me I say "ideology" weird because I say "id-ee-aa-luh-jee" instead of "ai-dee-aa-luh-jee", and I still never changed the pronunciation anyway.
I had a coworker once try to tell me I pronounced nihilism wrong - I say it nee... he claimed nye... was correct. He made such a a stink about it, actually yelling at me, that other coworkers were gathering around hoping for a fight... Somebody had a dictionary, so I looked it up, and of course both are listed as correct. He then moved the goalposts saying his way was "more" correct... but I got the last word - "I DON'T CARE!"