hmmm. I'm not sure that I have a good answer for you because I can name 1983746 reasons that don't like myself. But what helps me really understand and put a name to it is journaling. Like I will start off writing about one thing that I feel guilty about and then 'its like the time that this other thing happened' and things just go from there. Maybe if it doesn't come as easily for you, you could just start with a list of things that you feel guilty, angry, sad, etc about?