Mac, 49, said once he gets his performance film "The Whole Truth, Nothing But The Truth, So Help Me Mac" in the theaters, "I'm going to call it," E News said.
He said he's been doing standup in clubs since 1977 and street performances for two years before that, and that was enough.
"I'm going to still do my producing, my films, but I want to enjoy my life a little bit," the Chicago native told David Letterman on the Monday night show. "I missed a lot of things, you know."
His movie credits include "Bad Santa" and "Ocean's Eleven," and a dramatic turn in the upcoming "Pride."
He also wrote two books, "I Ain't Scared Of You " and "Maybe You Never Cry Again."
Aaron Carter will 'shut up' about ex Hilary Duff
Sophia Loren celebrates 80th birthday