All my life means 'since I was born', 'in my whole life'.
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User_garyBut when I said it out aloud in front of the camera it sounded like I had been saying it all my life.This sentence in this context means that she/he said this word out alound for the first time (it was probably a very difficult word to pronounce) but it came out very good, just like as if she/he had said it