We have all erred in past lives, so don't take it too hard! The South Node is about past lives, while the North is about the direction you need to go to correct things, beginning in this life. The 12th house is about secrets and sorrows, so in Pisces, and other lives, maybe you either worked in a prison or hospital where you saw sorrow. Or you may have had or known people close to you with substance abuse issues. Since the NN is in Virgo, it's telling you to walk a healthier path, not be so critical and to focus more on yourself to find out what is causing you to be unhappy or secretive. Change is hard, and we often make the same mistakes for many lifetimes. Aim for the Virgo traits and take better care of yourself. In Pisces incarnations, you probably wore yourself out caring for others or partying with them.