The stuttering does improve as you age. I had a severe stutter that I finally got control over. It improved throughout the years but was a real awful pain in the ass for far too long. I did it without speech therapy though. Biggest thing I learned was “fat to skinny” breathing and controlling my breath. Deep inhale before speaking and let a little air out before the words. Inhale again often before you run out of air. Keep your head up.