I don't want to fill you with a false sense of hope. In no way, shape or form is this meant to do that. But for many of us, it gets better. The thing that helped me the most was a change in environment. From about the age you are now. I was no longer in high school where I was mocked on a daily basis. I took speech therapy again and was given some "life changing" tips. My stutter is not cured, I block quite often mainly on certain words and sounds, but it's not as bad as it once was. I feel your pain, I really do. I hope it gets better for you. If you want specific advice, perhaps I can help.