Ask HN: How to Learn 'To Think'?

I am writing this desperate to find out what to do. Most of my life, I have been 'listening' passively, without thinking. I don't have an internal monologue. I had a neuropsych evaluation which commented on my poor memory and inability to think.

How do I learn how 'to think'? How do I learn to create an internal dialogue to comment on my surroundings and tasks?

I am hoping for a book recommendation, or maybe a blog post. I've heard that Ulysses is a stream-of-consciousness book, but I have not checked it out.

I would hope that books help - but I have read a lot of books and still don't think. I am hoping for a tutorial or something to practice.