That might be a factor but years of bad experiences condition a stutterer to so fear speaking that it's impossible to just forget they’re a stutterer. My stutter lasted from age 5 to age 70 and was caused by childhood trauma and possibly a genetic predisposition. I finally found a psychologist who helped me deconstruct my childhood and at age 70 I no longer stuttered and I'm fully fluent. Are you a stutterer or a speech therapist?