John Stamos' journey with alcohol addiction has been a long one, filled with many highs and lows. But there was one particular moment in his trek that pushed him to actually get clean — and stay that way.

In his debut memoir, If You Would Have Told Me, out Oct. 24, the Full House alum details the many low points of his alcohol addiction — and how sobriety has shaped him in the long run.

"I had to sober up.

I was just drinking too much," Stamos, 60, exclusively tells PEOPLE in this week's issue. "I just went low. I didn't go high. I just surrounded myself with people I shouldn't have been with."

For Stamos, his headline-making DUI in 2015 proved to be a breaking point in his addiction.

"I had that DUI and I was like, 'I can't do this. I've got to straighten up,'" he recalls. "That's when I was confusing the universe because I'm not a bad person, but I was doing crappy things.

"

Stamos eventually entered rehab, which he admits "was dark for a little bit." But he notes "it started to get better" and later "made a lot of really good friends.

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