I am currently in a country that speaks the language that I a very beginner at. Like, I know what I want to say in my head but it's so hard to get it out and I begin to stutter. I am not sure why - is it because I'm afraid to make a mistake? Maybe it's confidence. If I switch to English, it's butter smooth. Even though English is also not my first language. So in the end of the day, it might be about confidence and the 'just do it' feeling.