Feelings of guilt are weird. Being a victim of abuse, I felt guilty for a long time, as if I had brought it upon myself. In fact, that's what my abusers told me consistently: Just stop being yourself, and you won't get hurt. One school counselor told me repeatedly to "change my personality." I was in sixth grade, when I was just figuring out my baseline personality, and who in their right mind would change their personality just to be accepted? I wanted people to stop hitting me and smearing crap (human feces) in my locker. I thought it was a straightforward situation, but I was constantly barraged with feelings of, "This is my fault."
And I still struggle with those feelings. It took over a year of therapy and a mood stabilizing medication, as well as a medication to manage my frequent, visceral nightmares. It also became a matter of becoming self-aware, and recognizing what abuse is, and what it isn't.
Abuse is evil, but it is never the fault of the victim. Ever.
I still struggle with feelings of guilt, but not to the extent I used to. When I feel guilt, I ask myself, "Should I feel this way? Why do I feel this way?" If I can't rationally conclude I did something wrong, the feelings of guilt diminish. I recommend cognitive behavioral therapy (CBT) for anyone and everyone.
What you think influences what you feel. What you feel influences what you do. What you do reinforces what you think. You want to change? Change what you think, persistently.