Totally relate to this. I have messed up so many interviews due to this. Even if I know more than any other candidate in the job interview, there is only 10%(best case) chance that I would be selected for the next round. I was extremely lucky to find a job after masters and stuck with it for 11 years because honestly, I didn't know if anyone else would take me if I resigned. Others were preferred over me when it came to promotions and increments simply because they could communicate better. Now I am unemployed and more than the job market, it's my confidence in myself that has taken a hit after only a couple of bad interviews. Even if someone can look past my stutter and is willing to gite me, I would have to settle for way less than what someone who speaks normally with my experience and expertise will get.It's so frustrating and I feel so hopeless and helpless at times.