When the author has charlie tell us what he regrets or feels angry about what do we discover?

From the text: Things that make Charlie angry.

"I don't regret the experiment."

"I'll tell you something. I'm sick and tired of coming here. What's the sense of therapy any more? You know as well as I do what's going to happen."

I have to look up even simple words in the dictionary now and it makes me

angry with myself.