When I was little, I read ALL THE TIME. I read way above my grade level, and as a result, I encountered a lot of big words that I didn't hear used in speech. This led to an unfortunate symptom of my reading: embarrassing mispronunciation.
I STILL read "misled" as "MIZE-uld" because that's how I thought it was said when I was little. I didn't get my first dictionary until my seventh birthday (I had very understanding friends) so through elementary and middle school, I had some trouble. I knew what the words meant and how they were spelled, but not the proper pronunciation. Even after I learned the proper pronunciations, some things were hard to shake.