I'm sorry you're experiencing this. I'm 27 now (stuttering since I was 2) but when I was a kid, my mom would get annoyed with my stutter and it made it so much worse. Now my stutter gets worse whenever I talk to my mom just because I'm anxious of her negative response to my stutter. Someone else on here suggested seeing if your school has a speech therapist. I think that's a great thing to do. Nothing will get better with yelling, but it can get better with support.