If you experienced toxic, dysfunctional, unloving or emotionally abusive parenting, then you were consistently made to feel ashamed. It therefore became part of your subconscious programming, and - even an as adult - your subconscious belief is that there is something fundamentally wrong with you.
Perhaps you even heard things like, ‘You should be ashamed of yourself!’, or ‘Shame on you!’
The toxic shame stays buried within you, and it becomes a part of your identity.
So, rather than seeing that you made a mistake, you believe you are a mistake.
You didn’t do something ‘bad’… you are innately bad.
You feel sorry and ashamed about who you are as a person.