The former 'Bond' star, who recently launched a foul-mouthed tirade on 007 bosses for sacking him as the onscreen spy, said he has a lot of "self loathing" and spends hours doubting his talents.
He said: "I know what it's like to loathe oneself. To feel that deep self-loathing. It's painful and ugly and [bleeping] unwanted. And it gets in the way. I can dip in there, into the old black-Irish melancholy.
He added to America's Life magazine: "You think, Am I smart enough? Am I equipped enough to deal with it all? You don't want it to happen, but it's part of life."