Forgiveness, so I've heard is to move forward.
Take stock of what/why you feel guilty for.
Make a list, one at a time.
And you will see guilt and blame is often misplaced.
Realize things in your childhood you may have been subjected to were not within your power to control. Parents have the power.
To take responsibilty, acknowledgment equals to receive/acceptance of facts not emotions, emotions can be misleading.
An overwhelming sense of Guilt is self destuctive a self imposed punishment.
I often do this, I blame myself for allowing myself feelings of blame which are misplaced and learning to change my perspective.