I made sure the sites that I picked for my externships will allow me semi-autonomy, like how it is at The Eye Institute. I knew by talking to the doctors as well as looking at the evaluations of the site from the class above us.
I am sorry you feel frustrated, I can understand. I know someone in the class above me who feels the same way as you. She tried talking to the doctor, but thats just how the site is set up. She only has to be there three months. So, hopfully, you'll get a more enjoyable experience at your next site!