You may want to consider going to a different studio then that offers more group classes. Maybe going back to an AM. As to not knowing many followers at the parties; there are two ways of fixing that issue. One, ask more of the followers that you don't know to dance and socialize a bit. Nothing ventured nothing gained. Two, invite someone from the group class to go a long with you. At least then you are in good company of not feeling very confident about your dancing and the two of you can boost each other's confidence up.