I think this is more attributed to how the people around you spoke rather than strictly reading.

My college roommate and I both grew up reading. My family also read books and one parent was college educated. Her family only read the local paper (6th grade reading level). She was the only reader in her family.

So we both grew up reading, but I could pronounce words she couldn't simply because the people around me also knew and used them.

It genuinely is hard to master more obscure English pronunciation because so much of it is made up of loan words from very different languages, but this will help as a general principle to follow.

Annihilator - i used to say annie he lator - the spelling on this word. Seriously.

Hyperbole - like 2 years ago i found out its not hyper bowl. Really?

Onyx - Onks. On icks? Only 40 years saying that word wrong.....

Arm-MEG-addon

One of my buddies is in his fifties. He's been an avid reader his entire life. He pronounces "chasm" with the ch of "chicken" no matter how much we correct him. I've known him long enough for that word to actually have shown up in conversation a not-insignificant number of times.

People care way too much about correcting people on how to pronounce certain words.

Names from other languages I think are especially obvious for the self taught or avid reader. Euler, Goethe, Camus, etc

Reading comments here: TIL

chaos, debris, plumber. I hate the english language.

Thanks to Hugo's House of Horrors, a childhood of peh-nuh-lope for Penelope

Had to hear Triumvirate before I said it out lound...but honestly it has never come up in casual conversation, so go figure.