Does this happen with y'all?

Does this happen with y'all? Some days when I practice speaking a lot before mirror, I barely stutter. However, barely stuttering on the sentences makes me very confident. I, then, get lost in thoughts and build imaginary walls in my mind that I can't speak that particular work. This causes anxiety. I start to stutter very bad. And it all feels like I'm a shitty person. Everyone will be making fun of my stuttering and awkwardness caused by stuttering. Context is: do y'all feel shit and stuff when you stutter a lot and start living in the thoughts instead of present moment?