"Both in the lighthearted 'I'm anxious about this' kind of thing, and I've been to the depths of the darker end of the spectrum, which is not fun," he said.
The 41-year-old further revealed his early 20s became his "real unhinged phase."
"I was partying and just trying to make myself vanish in some way," he said, admitting that he self-medicated to deal with crippling anxiety, though he stopped when some of his friends died of overdoses.
"When the curtain opens, I turn on this knucklehead, and he kind of takes over and goes away again once I walk off set," he explained. "That's that great self-defense mechanism. I figure if you're going to jump off a cliff, you might as well fly."