The actor completed a three-week stint in rehab earlier this year for a prescription drug addiction that developed after his injury on the Chasing Mavericks set.
In an interview with Men's Journal, Butler said that he has made great strides in his personal life this year.
"Maybe a stronger person wouldn't have needed to go [to rehab]," Butler admitted. "When you hear the word rehab, you think, 'He's a mess, he's f**ked up'. But I'm glad I did it!"
He added: "I've made a s**tload of wrong decisions in my life. But I know I've made some right ones as well."
Butler went on to credit the treatment with helping him cope with the pain not just from his Chasing Mavericks surfing accident, but also from lingering issues dating back to the 300 shoot.
"I was actually taking a minimal amount [of pills] when I went in," he recalled. "It was more about becoming a mental warrior and not letting pain bother you.
"The [instructor] would say, 'I don't want to hear about your f**king MRIs or your f**king X-rays... Let's learn how to say to the pain, 'F**k you'."
Chasing Mavericks stars Butler as the mentor to a surfer who goes on a quest to conquer America's most dangerous wave.
The movie - which also stars Abigail Breslin and Elisabeth Shue - opens on October 26 in the US and on November 2 in the UK.
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