I did some research about stuttering and foreign languages ( I did Korean language post last month )

I did some research about stuttering and foreign languages ( I did Korean language post last month ) Hello, so, my theory is that.. like i said before, i stutter in Czech and English, but not in new language, which am learning. Maybe its some way to trick brain, i guess we unconsciously feel fear from speaking and brain is aware of the language we used for long time, which sounds or which situation, someone have block type of stutter or problem with specific sound. So maybe its some kind of brain trick, u know, this is completely new language and never did slutter in it, so i don't have to worry. But lof of people are sluttering more or less, even in foreign language, so its not complete theory, there are few more elements, but i believe that its some kind of trick for brain, we all know, stuttering is just all in the head. ( If i am not counting brain damage from acccidents and such. )