“I felt embarrassed, inadequate,” the veteran actor writes in his new memoir.

I would leave a word out, a line out.

Winkler continues, “My brain and I were in different zip codes.

HAPPY DAYS

Harry Winkler as Fonzie on ‘Happy Days’.Everett Collection

Meanwhile, the other actors would be waiting, staring at me: It was humiliating and shameful.

Everybody in the cast was warm and supportive, but I constantly felt I was letting them down.

When Winkler was diagnosed, “I was so f—ing angry,” he writes.

Henry Winkler attends the SAG-AFTRA Foundation Conversations Career Retrospective with Henry Winkler at the SAG-AFTRA Foundation Screening Room on November 4, 2018 in Los Angeles, California

Henry Winkler.Amanda Edwards/Getty Images

“All the misery I’d gone through had been for nothing.

It wasn’t a way I decided to be!

And then I went from feeling this massive anger to fighting through it.”

TheBarrystar previously explained that he learned about his disability after his stepson was tested and evaluated for dyslexia.

Being Henry: The Fonz… and Beyondis out Oct. 31.