JOSH'S WILD YOUTH OF 'TWEEN TRIPPING!

DEADPOOL 2 star Josh Brolin confesses he grew up as a wild youth, dropping acid when he was just 13 years old and passing out on a sidewalk at 15!

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The 56-year-old Avengers villain recalls his crazy drug-filled youth and a more recent knife attack in his just-released memoir, From Under the Truck.

"I would not want to be in my 20s again," says Josh.

The son of actor James Brolin recalls his early days in California, dropping LSD with his Cito Rats surfing gang.