I'm sorry your sister is so awful. It sounds like the only "negative energy" is her own. We all have specific anxiety triggers that are hard to overcome. Yours is not so unusual, try not to feel ashamed. Understand that this is not a rational response that you can just "get over". It takes a lot of time and hard work and maybe even therapy to overcome that kind of anxiety. I had a similar anxiety about phone calls for a long time. Only being out on my own and just having to make calls made me get over it. My main advice is to remember that whoever hears you at the restaurant isn't going to care that you stutter. The waiter just has a job to do. He's thinking about whether or not the cute greeter girl has a girlfriend, or if he'll make enough in tips to pay for that new PS5. Your stutter wouldn't even rate a "what happened at work" story to his roommate. What I try to remember is that 99% of the people who I am worried about stuttering in front of... Simply do not care and I will probably never see again. Maybe they'll be confused or think "huh, that's weird" .... but unlike kids in school, people won't go out of their way to make fun of you. They have other shit to think about. I think that's what helped me the most, realizing that most people are not actually paying that much attention to how you speak. Sure, it'll be noticed, but they'd notice if you had a different accent or blue hair, too. But it wouldn't be something they'd bother passing judgement on. If you want to try to get over the anxiety, maybe try going to a restaurant by yourself, during a time that is not very busy, so there's fewer people around? Then you're not worried about talking in front of your family or friends etc. Or even start by going to like McDonald's or something. Start easy like "give me a number 7" or whatever. Do that every once in a while (if you can, I know 18 year olds aren't usually flush with money) and you'll start to get more used to it. Then when you're not filled with anxiety ordering in McDonald's, try somewhere else. Maybe a takeout place. You might never do it without stuttering. I'm 46, I still stutter when I order. But I *care* less and *worry* less about it. And that means I also stutter less. It's a self-reinforcing cycle.