I understand everything you're going through. I've had a stutter since I was five or six and I always kind of hoped it would just ... fix itself. I'm 36 and it's still here. I mostly have it under control but I have to actively work on it and I still have good days and bad days. There's a very low, if any, chance that your stutter will magically "go away" on it's own. I've been stuttering. Speech therapy can teach you some techniques but ultimately it rests on you to apply them. If you can't do therapy or just don't want to you can check out [Self-Therapy for the Stutterer](https://www.stutteringhelp.org/sites/default/files/Migrate/book0012_11th_ed.pdf), a free book that I find to be quite helpful. It contains the same basic techniques I learned in therapy. ​