By Dave Quinn
Updated July 22, 2016 at 05:32 PM EDT
Credit: Paula Lobo/ABC via Getty Images

Australian singer Sia is a chart-topping, award-winning, global superstar. But despite all her success, the 40-year-old musician still doesn’t love the spotlight.

Before taking the stage at Good Morning America‘s summer concert series, Sia admitted to anchor Amy Robach her biggest fear. “I do not love performing,” she said. “I get really scared.”

She went on to say that she broke down backstage before her appearance.

“I just cried in the dressing room,” she said. “I’m really croaky and I was like ‘I’m not going to hit the high note and I want everyone to like me.’ It’s scary to perform!”

So why does Sia do it?

“I do it because I want to make you happy,” Sia said, to the cheers of the crowd gathered in New York’s Central Park.

Of course, Sia was able to pull through on GMA, singing her hit songs “Chandelier,” “Cheap Thrills” and her new single “Unstoppable.”

Longtime fans know of Sia’s stage fright. It’s one of the reasons she wears oversized wigs, looking to preserve her anonymity and let her audience just focus on her voice. But can she see while performing in them?

“Yeah, I see them through my little tiny bangs’ slits,” she said.

Sia is getting ready to launch her first North American tour to support her new album,

This Is Acting.

“It’s a pretty weird ride,” she told Robach of the tour. “It’s more like a theatrical experience. It’s unusual, I would say. It’s an unusual experience. But even kids like it!”