The Linkin Park frontman described himself as a "full-blown, raging alcoholic" in the past and said that he "shudders" when thinking about his childhood.
Bennington told Kerrang: "I don't drink. I choose to be sober now. I have drunk over the last six years, but I just don't want to be that person anymore.
"If I think back to when I was really young, to when I was being molested, to when all these horrible things were going on around me, I shudder."
Linkin Park released their live acoustic cover version of Adele's 'Rolling in the Deep' earlier this week.
The band have started work on their upcoming fifth studio album, according to rapper Mike Shinoda.
Watch Linkin Park perform 'Rolling in the Deep' at the iTunes Festival below: