I’m sorry for what you’re going through — I had a similar home situation for many years. You need to get away from your father and grandmother if that’s how they’re treating you. I know it’s hard to get on your feet alone — but it can be done. Once you’re on your own and self sufficient, you won’t be as bothered by it. I also have a severe stutter and finally got a job where I don’t have to answer phones or speak very much, and I’m very happy. People I speak to socially don’t mind it, I’ve chosen my friends (and favored family) wisely. Getting away from the negativity is going to be the big one — make some money, save, move away. You can do it.