United Kingdom, Sept. 2 -- Charlie Sheen feels "shame shivers" over his turbulent past.

The actor, 59, is celebrating eight years without drugs or alcohol, and has now given a frank interview about his partying days.

Charlie told People magazine about the difficulty of forgiving himself: "Forgiveness is still an evolving thing. I still get what I call the 'shame shivers.'

"These are the moments that hit me, of the heinous memories and choices and consequences.

"They're getting farther in between, so I guess that's progress.

"What has been interesting about making amends is that most people have been like, 'Hey yeah, we're good man, but we hope you've also forgiven yourself.'"

Charlie rose to fame with roles in Ferris Bueller's Day O...