"My fans are so important to me and I would never want to disappoint them," the 21-year-old singer and actress said in a statement Thursday.
"But it has become clear to me and those close to me that after many years of putting my work first, I need to spend some time on myself in order to be the best person I can be," she said. "To my fans, I sincerely apologize and I hope you guys know how much each and every one of you mean to me."
"She has been working non-stop for six years," an unnamed insider told UsMagazine.com. "She needs to take some time for herself. It was a very hard decision because she hates disappointing fans but she needs to focus on her for a bit. She wants to stay healthy."
2014: The Year in Music [PHOTOS]