Stuttering is caused by a neurological phenomenon and is NOT caused by low self confidence. This person is ignorant, many people are about stuttering. Thinking it's all about talking too fast or anxiety. But those symptoms are a result of stuttering, not what causes it. Stuttering can be managed but not cured. Do work on your self confidence as a person who stutters. Self acceptance is crucial to you being able to have a happy and fulfilling life. Bring a stutterer is like playing life on hard mode when everyone else has cheat codes. It's more challenging but when you succeed it will be hard earned.