I've always been anxious even before I stuttered but my willingness to try new things and do what I want has pushed me to do alot of stuff. When I was in highschool I had to present what I had made in front of about 50-150 people so almost the whole school and I pushed through the anxiety and my stutter and did pretty good. Even though I never really had to do presentation in class I always ended up doing them even if I stuttered through them. To be honest I've always been confident despite my stutter but I mean I still get extremely nervous when stuff happens but I've learned to just say screw it and go with the flow.