This is not "normal" behaviour on your Mother's part, but your experience is far from rare. I too had a Mother who constantly saw the negative in most things, and clearly saw it as her lifelong mission to try to make me feel guilty and inadequate. Like you, I eventually let her know in detail how I felt when her behaviour started to impact negatively upon my children. As in your case, she was incapable of acknowledging her culpability in all this, and even tried to imply that I was somehow largely responsible. From that point on I had as little to do with her as possible, and my family life was immediately brighter without her baleful influence. She went to her grave still bitter and twisted and unreconciled, but that was her choice..not mine. As for your Mother's behaviour being due to "introversion"... absolutely not. Introverts can still be affectionate and loving to those who are close to them. Your Mother's behaviour is sociopathic, and such traits are very deep-rooted and unlikely to change. I do sympathise, but would strongly recommend that like me, you get on with your life, and get out from under that dark cloud which is constantly with her.