It sounds like your dad has some very serious mental health issues possibly along the lines of schizophrenia or a personality disorder. Do some research on the subject and see if you find things that sound like how your father behaves. If you do, it will help you make sense of what you're going through.

My sister has what I believe is a personality disorder. Hef life is far worse than anyone else's, and it's almost like she's happy it is. My elderly mother has to support her as she has so many physical and mental health issues she hasn't been able to work for years. I've done all I can for her to no avail. Realizing she has a personality disorder helps me deal with the guilt of watching her life fall apart because she won't help herself. I feel your pain.