This anger is good. If I were you, I would use this anger to my advantage and overcome the anxiety of stuttering in public and throw myself into worst stuttering situations without controling my fluency (actually go for stuttering). If you do this for a while, youll see that youll be less anxious, quality of your life will improve and eventually youll stutter less. Just remember that your main goal should be overcoming the anxiety of your stutter, not fluency.