How can thoughts hurt so much when they aren't even physical?

How can thoughts hurt so much when they aren't even physical?

I’ve got to sleep. Sleep is my only way to escape.

I guess I'll never measure up to anyone's expectations. I surely don't measure up to what I'd like to be.

I'm not really sure which parts of myself are real and which parts are things I've gotten from books.

How is it possible for me to be so miserable and embarrassed and humiliated and beaten an function still talk and smile and concentrate?

They don’t think “I care,” “I hurt,” or “I have feelings.” It just seems like I’m always “wrong,” always “selfish,” always “self-centered” and everything else that’s negative and destructive.