Just own it, it's not your fault you have this condition. Whenever i stutter when speaking to some stranger i just say i have a speech impediment, or if i stutter when saying that i try to use other words. When they laugh or get annoyed just don't give a fuck, that kind of people are what you said in the post, worthless. When i stopped giving a single damn about what others think, it was like the whole world opened to me, instant relief. You have nothing to escape from. Take care dude.