John Boyega is doing a lot of thinking about his “Star Wars” roots!

In a new book called “The Galaxy’s Greatest Heroes,” Boyega opened up about his audition.

He went into detail about his “seven months of extreme auditioning.”

Later, he kept getting questions from media outlets about his part.

He didn’t know anything for sure until J.J. Abrams called him into a café in London.

He asked him if he was ready for training – as an actor and physically.

Boyega said he was so shocked he was willing himself to breathe!

He said that “it was probably the happiest day of my life!”