Stuttering when alone but don’t stutter as much when not alone

Stuttering when alone but don’t stutter as much when not alone Am i weird? I see so many posts about “Not Stuttering When Alone” but mine is backwards. Yes i do not stutter as much when i’m alone if i’m speaking or reading with English or My Country Language. But when i speak Japanese (i’m currently learning the language) it’s backwards. Recently, i have a reading lesson and it was time to read in front of the class. I read and read the day before the lesson and i stutter sooo bad with it (like i’m back to how i was back then when using this new language) but when i read aloud in front, I didn’t stutter as much as i though i would and had a little conversation with my teacher with Japanese Language (like what did you understand and stuff) Does some of you have something like this? I also felt like i’m instinctively changing my pitch of voice to higher when speaking the language aloud. Is that the reason?