Two ways. First is not to care about stuttering and just aways say what you need to say. Don't care about what others think, don't care about making a scene. Just Speak. Second option, when your stuttering flairs up, talk a break from speaking, don't push yourself too much and continue tormenting yourself for being a stutter. Relax and come back to it another day. I think we are our worst critics, give yourself a break.