Billie Eilish never thought her song “Bad Guy” would be a hit.

“I don’t know what people want anymore,” she said on The Howard Stern Show on Monday. “Because I thought that everyone would hate ‘Bad Guy’ and that everyone would hate ‘When the Party’s Over.’ I don’t know what to expect now.”

Eilish also expressed mixed feelings about becoming famous when she was a younger teen. “Because it happened when I was 13, there’s a part of me that feels I did miss being a teenager, like I didn’t get to be a [normal] teenager,” the now-17-year-old said. “I get more and more grateful for it happening that young because I feel like, if it had happened later, people would be able to dig up dirt from when I was that age. If this hadn’t happened at that age, I would have been doing some reckless shit.”

The singer’s brother Finneas—who’s also her songwriting and producing partner—appeared on the show with her. Together, they improvised a song about sleep paralysis, per Stern’s suggestion. They also performed an acoustic version of “All the Good Girls Go to Hell,” both of which you can watch below.

While discussing her brother, Eilish said, “Yeah, he’s my brother, but we’re great friends,” adding that Finneas is “a way better songwriter, way better person.”