Shame usually accompanies guilt.
It's an emotion that holds us down, like a pressing weight. It binds us to our past like a ball and chain. It does not know how to forgive. Perhaps it does not even believe in forgiveness!
Shame "has no shame"
It is content to destroy our self-worth and identity, and to burden us with self-loathing and self-destruction.
Learning to process our shame; bringing it into "the light" and acknowledging our emotions around shame - breaks it's power over us.