updated 07/02/2014 AT 4:00 PM ET
•originally published 07/04/2014 AT 6:25 PM ET
Katy Perry has an apology to make.
“I have coffee breath,” the singer says as she curls up on a couch. “Sorry if it bothers you!”
Lately, she has really needed the caffeine: Perry is in the midst of the U.S. leg of her Prismatic tour; running through next March, it will bring her to Australia and across Europe.
“It’s taking all my energy,” she says of her worldwide neon-tinged trek.
But that hard work is paying off.
Her fourth album, Prism, gave the singer her best debut yet, and the lead single “Roar” has gone platinum six times.
“A lot of times I write these songs because I need to reinspire myself,” says Perry.
“When I was writing ‘Roar,’ I was like, ‘I need to find my voice again. I need to be heard. I need to find that empowering thunder in my chest again.’”
“I still feel 13 on the inside,” she says of hitting the milestone in October.
“Birthdays are a big thing for me. We always have a themed party. It’s a good excuse for me to bring my friends together and go buck wild.”
But don’t expect her to go too crazy. Perry – who recently teamed up with Staples and DonorsChoose.org for the Make Roar Happen campaign, which benefits teachers – has some very practical wishes as she enters the next decade of her life.
“I just want to be able to continue to stay self-aware and as unaffected as possible,” Perry says. “I just want to stay authentic and keep dreaming my dreams.”