I think sooner or later in your life, you will reach the "i dont give a fuck" point. When you reach this point, the "i dont give a fuck" mindset will improve your long term mental health and also your speech. ​ I´ve noticed many people reached this point at their 30-ties. ​ I was like you my whole life. Now I can mostly talk fluenty, sometimes severe stutter comes back. My mood depended a lot on how I spoke. But I feel happy and if I cccc........(15 seconds later) cant say something, who cares. Literally nobody cares. Myself included.