Through my stutter has improved over the years, it's not fully goen yet (I really hope the yet is true) But my advice for you would be to relax more. I'm assuming, like me, your stress comes from you fearing what people will think of your stutter or in this case the silence caused by it. I can tell you that no one really cares about the silence. And if they do they will fill it themselves. Just (as if it's an easy think to ask ya know) ask your friends what they think of the stuttering. It won't be as bad as you fear I'm sure of it.