I always think,that I'm gonna stutter

I always think,that I'm gonna stutter I always think,that I'm gonna stutter.When I'm opening my mouth,or it doesn't matter opened or not,firstly I analize the letter of all words in sentence I wanna say...And I really can't fix it,I can't control it.Please anyone,who faced,or facing with it what u did or what u're doing to control that? By the way,I even think 'bout it when I'm talking with myself,so it doesn't care with whom I'm talking. Wish u all,luck and thanks for the answers!💜