I understand exactly how you feel. It's not easy to get over the anger and frustration but trust me you have to realize that the ways you've been coping with your stutter haven't been healthy and that you have to make a change. For one of my majors there was a group project that required us to have two in person meetings with our supervisor. In those meetings I stuttered quite a bit and but I'm happy to say that the meeting was productive and I feel that me asking those questions helped me as well as my team mates Also for this project I was a group leader and no one had issues with my stutter since they knew Im someone who's responsible and would do the job properly. So try and not be so hard on yourself and think about what you're saying more than how you're saying it. Some people have fluent speech but the content of there speech ie.derogatory statements, hurtful comments is what antagonize people.