Why do we struggle so much when we try to pronounce something correctly? [closed]

Being native speakers of English, You guys pronounce all the words exactly the way they should be pronounced effortlessly, no matter how fast you speak.

This is not always true. People who read widely sometimes have a larger vocabulary than their peers and so have never heard the word spoken correctly.

As an example, I once heard my now deceased father pronounce "placebo" as "place bo" instead of "pla see bo".

Given his great age at the time I didn't think it useful to correct him.

A common pronunciation error, especially in young readers is "misled". The standard pronunciation of this is "miss led" whereas the mistaken version is something like "myzled".

Note how difficult it is for me to show pronunciations in the above paragraph. English spelling is insufficiently phonetic to achieve much success at this. There are more vowel sounds in English (especially southern British English) than there are symbols (a, e, i, o, u) to represent them.

Note also that US, UK and other regional pronunciations differ for many words.

P.S. If you are familiar with IPA then, by using a suitable dictionary, you can learn conventional pronunciations. https://en.wikipedia.org/wiki/International_Phonetic_Alphabet_chart_for_English_dialects

Here is an IPA dictionary that also allows you to hear the words (in British English). https://www.oxfordlearnersdictionaries.com/definition/english/ipa