Practice as much as you can when u are alone. You cant get rid of it but can learn how to manage your communication. As far as your job goes, no one really cares as long as you make your point. Even your objective should also be to just get your point across, that's it. When u become comfortable with who you are, all your problems will be solved. Just to give u a perspective, a data science expert in my company gave a presentation at a town hall and stuttered so badly. But his content was gold and so everyone just focused on what he said rather than how he said it.