I could've slept in

So today there was testing at my school, but I don't take the classes that were testing so I technically don't have to be here until 10. But I got here at the normal time, 8, because I was supposed to have a rehearsal with a friend of mine so were prepared for our audition next week. She decided that she thought I wasn't coming, so she didn't show up, and now I've been in a practice room for the last 2 hours with nothing to do except practice, and practicing for that long can damage your wrists and hands, so I couldn't even practice the whole time; Tired and frustrated