Stuttering specialist SLP here as well as a man who had blocks that seem just like yours through high school. This is a normal part of the life we all live here and normal feelings to go through and they suck. Uncomfortability is the only way to have growth and I wish you nothing but the best in finding coping strategies and growing your way through this. If you were a client of mine I would recommend seeking a therapist, even your school counselor, and just talking with them about it. To a mental health therapist this is just another example of an incorrect thought (our feelings about our stutter) holding us back/affecting our lives. They are experts in that field and can do a lot for you if you let them