from a recent post:
There is a feeling that deep down, I am a bad person who needs to hide my truest self. . .even though when I try to figure out why I am bad, I can't think of any reason. But it's just something that I feel. And I am afraid that if people really knew me, they would not like me. I'm afraid they only like the surface me.

here is the result of childhood abuse, acquired before the child could even talk.
No amount of reassurances, no amount of positive assertions from others or from oneself can make a dent in this most basic idea of self, which poisons all, in spite of all What is the antidote?