"I do get nervous. If I don't have a guitar, I'm, like, a mess," the rock star told reporters in New York.May 16 (UPI) -- He's been the lead singer of the Goo Goo Dolls for 30 years, but John Rzeznik still gets nervous in certain situations.Case in point: Reporters at a recent New York press day asked Rzeznik what song fans request most. "I thought it would have been 'Iris,'" he said, "But there is a song called 'Better Days,' which, actually, more people have listened to that song than 'Iris,' which I thought was really weird."So he was coaxed to sing a few bars."No! I get nervous," he said.