What can I do to diffuse my NCO from prying into my personal life?

There are a ton of things you can do....consult your concerns with the supervisor, let him know where you stand on social functions, prying into your personal life is out of bounds, having you perform more additional duties because of failure to participate is unacceptable. now, after you have consulted with him and things keep going the wrong direction, make sure you keep notes, date, and time of your counseling session, next step is to use your chain of command. in the end if all fails you still have options: a) request for transfer to new unit, b) the Inspector General is another route you can go, however, have your ducks in line, C) social actions would be another resort. social actions is simply a base organization that is used to intervene when there is problem in unit that needs to be resolved. the commander and 1st shirt are brought into light which they already know about the problem because you used the chain of command. social actions ensure the commander or 1st shirt are communicating the concerns to the supervisor. take your pick but be very cautious.