Exactly same here. I don't shutter at all when I sing. I used to sing during functions in the past. But when I talk to strangers and family members when I need to ask something I stutter or when I ask them a question but they ask me to repeat I stutter . When they ask something I sometimes stutter and sometimes not. I stutter when I think the person is very important like my manager/relatives/crush/girls I stutter. When I tiared I stutter. When I was in school When sir ask my name in whole class I stutter but Normally can tell my name but during that time I stutter and my face becomes red and a get anxiety/panic attack and it subsidise after sometime I stutter and get mocked in whole class. Was Not able to say present/yes sir when sir count my roll number . Is it because of adrenal hormone that causes stress/anxiety etc? I can talk everything to myself fluently without any single stutter but same thing when I say to others I stutter. Is it possible to treat this type of stuttering?