I know the feeling. School was hell for me. I stopped doing my homework because I didn't want to answer questions in class. You're only about two years away form the "real" world. School is a very pressurized social situation. Adults recognize that everyone has problems and are far more accepting, and you're not trapped in that school ecosystem. The social anxiety of worrying what people will think of you really falls away when you get out of school. Your speaking class might might go well, it might suck, but one thing you know is it's not going to literally kill you. So keep on keeping on. You're winning just by showing up. Just going to make you a stronger person in the long run.