I'm a mental health specialist, sometimes my clients ask me why I can't talk correctly but I just tell them I have a speech impediment and 9 times out of 10 they're actually really sweet about it. Luckily my stutter has never been an issue in a crisis situation though so it's never stopped me from communicating effectively. Plus if I do stutter, so what. As long as they understood the message I was trying to communicate it doesn't really matter how it comes out of my mouth.