Does your wife have a diagnosis from a consultant psychiatrist of narcissistic personality? Otherwise this sounds like an abusive term you are using to demean her. What personality description does she use for you?
If it is equally unpleasant, then it certainly sounds as if there is not enough love between you to sustain the marriage any further. Perhaps consider why you married your wife, what her positive attributes were (besides looks) and what she has contributed to the marriage emotionally and practically.
Then consider what you have contributed to her as a person. There seems little point in prolonging a marital relationship that has no love or respect in it. The decision about divorce must be mutual, of course.
If it is impossible to hold a rational and civilised discussion about separation with your wife, then use professional services and move forward.