OP, I feel your frustration. I signed up for third year rotations in a remote town, not knowing that my school didn't really have established rotations up here yet. There isn't a residency program for hundreds of miles. All the hospitals up here are in the process of shifting to a new EHR system, too, so everyone is 'too busy' to take med students. Basically this means that whoever can take me will take me, but they mostly don't teach much and don't necessarily feel comfortable letting me do much more than shadow. I do worry a lot about being ready for audition rotations.
Fortunately, I had a great IM preceptor who asked me to write extensive SOAP notes and email them to him, and we'd go over them the next day. I'm also finally writing some notes directly now that I'm on my surgery rotation. It feels awkward, but hopefully by the end of the rotation it will feel better.
Basically, ask your attendings if there are ways for you to practice. Even if they won't let you write in the chart for real, write your own note and ask them to give you feedback on it. It's not always going to go great, but just get the most out of each rotation that you can and make sure you visit some kick-ass hospitals for your sub-internships next year.