Just learn to scream. You won't stutter then :p. But fr fr? I don't know how old you are but something seemingly universal are fighting classes. I would say go do that, but I grew up pretty poor so if you have friends you trust to fuck around and fight with, do that. The odd confidence boost that comes with feeling that heightened anxiety shaved off a bit off the edge for me to begin getting good at not stuttering all the damn time. But I am a danger whore who did parkour bullshit until 29 when I began to accrue injuries lol.