The 28-year-old star is currently on a lengthy world tour but admitted it could be the last time she hits the road to perform.
According to the New Zealand Herald, she told fans at her concert at Auckland's Mount Smart Stadium: "Touring isn't something I'm good at - applause makes me feel a bit vulnerable. I don't know if I will ever tour again.
"The only reason I've toured is you. I'm not sure if touring is my bag. My greatest accomplishment in my career is this tour."
Adele broke records in every city she visited during her eight-concert tour of Australia.
The 'Hello' hitmaker sold as many as 600,000 tickets during her record-breaking tour Down Under, which included the biggest single concert ever held on Australian soil in Sydney's ANZ stadium, where she performed in front of 100,000 people.
Tour promoter Michael Coppel told the Daily Telegraph newspaper in Australia: "It's the highest-selling tour I've ever been involved with, which is quite remarkable after working with Pink and U2 and Fleetwood Mac and Roger Waters."
And Michael suggested Adele's achievement may never be repeated again.
Adele pushed her nerves aside to deliver a crowd-pleasing performance at Britain's Glastonbury Festival on Saturday night (June 25).
The Rolling in the Deep singer revealed she was nervous to an estimated crowd of 150,000 festivalgoers in Somerset, England and was so stunned by the turnout at the start of her set that the usually chatty star didn't know what to say so she moved swiftly from opener Hello to single Rumour Has It.
She’s usually a pleasant pop star, but Adele got pretty fired up after a snooty producer openly questioned if she has used auto tune on her records.
During a recent concert, the “Rolling in the Deep” dame referenced the comments of 72-year-old Tony Visconti, who recently told The Daily Star, "You turn the radio on and it's fluff, you are listening to 90 percent computerized voices. We know Adele has a great voice but it's even questionable if that is actually her voice or how much has been manipulated. We don't know."
Adele scolded a fan who was filming her show with a video camera.
The British superstar told off a concertgoer after she caught a fan filming with a camera on a tripod. The incident was caught by another fan, ironically, on their camera phone, at the star's show in Verona over the weekend.
She has the voice of an angel and the grace of a queen, yet even Adele manages to make mistakes from time to time.
During her performance in Lisbon, Portugal, the “Send My Love (To Your New Lover)” lady flubbed the lyrics to her lovely ditty “Million Years Ago,” and instead of glossing over it, she called herself out.