I don't know how one stops caring. I think it's different for everyone. I don't think it's something you can work on directly because the very act of working on not caring means you care. It's like when someone tells you not to thing about an elephant. If you're 15 and live in or have access to the US this is my #1 recommendation. It will help you build confidence, see role models, and not feel as alone. https://www.reddit.com/r/Stutter/comments/112gdbu/comment/j8lhs4g/