You may not think this, but, this is proof that there isn't anything phycological wrong with you. Seriously, nothing. You stutter because your mind relates speaking to a bad incident/trauma. While you may not recall any trauma or incident in your life, something happened and from then on you started stuttering. What my point is: YOU CAN completely remove your stutter. It will take time. I am a 17 year old guy, and I still to this date stutter. I don't know how and why, but I do. But the last couple of weeks I've came to the conclusion that I am not stuttering because there is something wrong with me. For example, if I am drunk, I do not stutter. Why? Because when I'm drunk, I have the confidence. I don't give a fuck about what people think of me. And when I don't care, I do not stutter. I wish you everything good in life, and I really hope you are able to start thinking like this in the future :)