Sometimes, people will ask you to repeat yourself because they didn’t hear you the first time you spoke. This is perfectly legitimate and happens to everyone occasionally.
Other times, you are convinced the people you spoke to heard you, but simply chose to ignore you. This happens often when you are a parent to small(ish) children, or perhaps teenagers (or face it, any kid currently living with you). There is a term for this behaviour: selective hearing. Granted, they may truly not hear you because they have ear buds in their ears listening to music, or are so tuned-in to their screens they are incapable of breaking their concentration to ‘hear’ your voice. Either way, you find yourself repeating the same words.