It's ok to get mad. You should be mad. I'm mad and I don't even know these people. Fact - Stuttering is not wrong. It's not something you should be scolded for. Your mother should be ashamed of herself. Your father too. And you need to stand up for yourself. When someone makes fun of you, don't shy away. Confront them head on. Ask them, "does it make you feel good to make me feel like shit?" You can't let people walk all over you. If you do then, eventually all those pent up emotions are gonna erupt out of you when you least expect it. Express yourself and tell people when they're being dickheads. Especially family and friends. You are who you are. And there is nothing wrong with who you are. But there is something wrong with the people who tell you otherwise.