I feel you. I get frustrated when I get nervous to talk to people or to make phone calls. I hate being hesitant to engage in simple communication. It’s interesting because I’m an introvert too, but I’m not sure if my stutter caused it. My dad is also an introvert but he is an excellent speaker. He’s MC’d several weddings and is a great speech giver. I think I’m an introvert but my stutter added to it. Yep it’s frustrating seeing people overcome theirs when mine more or less hasn’t changed in 20 years