This is what distinguishes an open jam with an instructional class. I have said over and over again, that if you get too comfortable
playing with the same people, it does not teach you how to join in with those you do not know or those you do not have as much experience playing a tune.
Putting you in awkward situations
in the bluegrass class instruction is not intended as evil
but is a way to teach you by putting you into as many uncomfortable situations as possible. In return, it hopefully prepares you to play with many others. In the long run, you will build greater confidence and be prepared to play in any situation. This will make you a happier
Remember, you can play all the open jams you want, but they do not necessarily train you to play the right way. This is especially true if those in an open jam have neither the experience nor a qualified instructor who provides guidance on how to play together, according to the same timing (rhythm).
and trust that you are being led in the right direction.