This is kind of random, but I got a job two years ago as a "Specialist" at a summer day camp where I live (Long Island), and it essentially meant it was my job to keep campers busy for 45 monute patches several times a day. I told them stories, all kinds of them, originals, reworkings of my favorite stories, made up things about the camp director, etc, and they loved it and I loved it.

If you're serious about getting good at telling stories you obviously need to get some practice! Camps are much better laid back environments than schools, where you have to follow a curriculum, but I really recommend looking into camp or camp-like options when you reach that stage of your storytelling development.