North Carolina coach Roy Williams said he was "the most frustrated I've ever been" in his team and his own coaching performance after the 13th-ranked Tar Heels lost to No. 5 Michigan, 84-67, on Wednesday night.

"Right now, we stink," a dejected Williams told reporters in his postgame news conference. "We work on the screen on the ball every day. And three plays in a row, they set a screen in the middle of the court and dunk it or lay it up.

"Guys, I've got no positive things. If you want some positive things, you better go out and find somebody on the street, because I've got no positives for me, no positives for my team."

North Carolina shot just 39 percent from the floor Wednesday and trailed by double figures for most of the second half. Freshman Coby White led the team with 12 points. Michigan, meanwhile, shot better than 57 percent and had two players score more than 20.

"It's very frustrating right now," Williams told reporters. "As a coach, I feel like I've done the worst job with this team in 31 years as a head coach. But give Michigan credit. They got tougher, they made the tougher plays."

Asked if perhaps North Carolina was struggling to integrate some of the incoming freshmen into its lineup, Williams offered his most blunt assessment of the evening: "Guys, I've coached for 31 years. Right now, my coaching sucks."

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Contact Tom Schad at tschad@usatoday.com or on Twitter @Tom_Schad.