I know that English pronunciation is difficult and if you're one of my students you already know how much I like phonetics and how I insist on you pronouncing English in a correct way.
We already discussed how mispronounced words lead to misunderstandings when speaking in English and therefore it's necessary for you to pronounce well if you want to communicate with other speakers.
I strongly recommend you to watch the following video since I'm sure you've mispronounced some (if not all) of the words that appear in it.