I mispronounce things all the time because of that (reading it often enough to be familiar with it, never hearing it aloud) and am always so grateful when people tell me how it's actually supposed to be said!

The ones that bother me tend to be grammatical issues.
Sometimes very common colloquialisms too, as in when people say "How are you?" and the answer comes "I'm doing good!" But they aren't performing a good deed or vanquishing evil -they mean they're "doing well". It bothers me! Every time!

There's a few words I can never enunciate properly

Emporium being one of them

Mom doesn't mind overly much, she likes it when I use more complex words, so having to correct me is a fair trade for her

I HATE it when people mispronounce things and then say 'it doesn't matter'. It does matter. Especially when they keep mispronouncing it on purpose. So rude.

Oh, or professional signs that have spelling errors. If you're going to do something for hire, you should proof-read!