He was an angry young man.

In his new documentary, “Billy Joel: And So It Goes” — which had its world premiere at the Tribeca Film Festival on Wednesday night — the “Piano Man,” 76, opened up about a dark time in his past.

When he was in his early 20s, Joel was in a band called Attila with his then-best friend, Jon Small. 10

During that time, Joel fell in love with Elizabeth Weber, who was Small’s then-wife. Joel attempted suicide over the affair — twice.

“I was just in a lot of pain … so I just thought I’d end it all,” he said on-screen. 10

After surviving, he quipped, “You can’t even do yourself in.”

The “Uptown Girl” singer has previously revealed his suicide attempt as early as 1990 , but he went into more detail in the documentary.

“Bill and I spent a lot of ti

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