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.
Mine was "daschund". I always thought that was a separate breed from a "doxen".
Even after being educated on how the word is actually pronounced, I still purposefully pronounce it literally "daschund". Fuck 'em - should've spelled it better.