I think majority of people that stutter tends to have social anxiety when in a social environment we might have the biggest confident and ambitious to do anything but when it's time to speak and express our self it gets very challenging and stuttering make the simplest thing in the world a big thing I notice I have anxiety when I'm talking but that's because of my stutter It just make me quiet majority of the times I promise u if this wasn't a thing we wouldn't feel the way we feel when we In social situations because why would u feel a curtain way when u speak very well and fluently like there wouldn't be nothing to worry about u wouldn't have anxiety or be shy or have all the bad thoughts, etc it just sucks ass as a person that stutter.