Hello I really feel you and know how bad it feels. The thing is that the more you try to not stutter the more you stutter. This is because you are more tense. You may feel defeated if stuttering makes you unable to express yourself, like in the situation you mentioned. Your stammer becomes less bothering if there is a way you can communicate when required. One way is relaxing your stomach and whispering. Hope it helps at least in extreme situations.