Hope the OP doesn't mind me having extended the thread on their behalf.
www.mumsnet.com/talk/_chat/4631339-things-im-embarrassed-to-have-realised-so-late-in-life?page=1
Just to agree with a few mispronounciations, I was much older than I should have been before I knew how things like Yosemite, epitome and Arkansas were pronounced.
Also Persephone, although my mum explained that one to me while I was still primary school age.