The 'Domino' star, who has already confessed to making some contestants cry, claimed that the singers will thank her in the long run.
© PA Images
Responding to claims that she is the "evil" coach, she told The Mirror: "That's good. The contestants have to realise they need to raise their game.
"I'm not saying it's easy - I know how it feels to step out on a stage in front of millions of people I don't know. When I performed on The X Factor last year, I was shaking like a leaf. But it's got to be done and they need to embrace it.
"I feel if I'd auditioned for one of these shows I wouldn't be doing what I'm doing today. You have to go through life's experiences - good or bad - to learn from them."
She also criticised the press for constantly comparing her to other female artists.
"[I'm compared to] Cheryl [Cole], Tulisa [Contostavlos], Nicole Scherzinger, but I'm so bored by it all," she said.
"When Tulisa and I get together we don't talk about X Factor or The Voice, or ratings or tactics. We talk about being young, fake tan and make-up!"
Jessie J recently turned down Simon Cowell's offer to join The X Factor.
The Voice UK continues tonight (April 7) at 7pm on BBC One.
The Voice UK week three: First look pictures
Watch Jessie J in her video for 'Domino' below:
