As I person who stuttered since I began to speak, I’ve had the same issue. I wish I knew the cause or reason behind this. In theory, you are basically talking to no one except yourself. But in reality, you are subconsciously are aware that you are indeed talking to a human. A person that has the ability to judge you, make first impressions and possibly discriminate against you. I have yet to figure this out. I have been back in Speech Therapy for about 3 weeks now. I do so well in the controlled environment... of the square office that I do not have to worry about all the negative. But once in the real world, all my training, all my comfort and therapy just goes out the door.