This exactly is my problem. I've been speaking English all my life and I think I'm even starting to overcome my stuttering in English. But when it comes to my native language I find it so difficult to speak and this has made me and my dad distant because I avoid talking to him and that's the language he primarily speaks. It's really depressing but I'm starting to practice and hope one day I'll be able to have a conversation with my dad in my native language without fear.