You need to distract your conscience self from the fact that you stutter. Forget you have a stutter and the stress along with the reflex of when your about to stutter will go away. All I can say is be eager talking to a group of people. Speak loud. Project your voice. It’s nerve racking at first but when you push yourself over and over it will get easier over time. Trust me. See it as something you just gotta do and do it. I also recommend running. And hang out with nonjudgmental rambunctious people. Your stutter will disappear trust me.