“You have to be indestructible to do what you love, and believe that you are worth it.”

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About three decades, three BAFTAs, four Golden Globes and an Oscar ago, Kate Winslet was a blue-collar kid from Berkshire being bullied at school.

“They called me Blubber. Teased me for wanting to act. Locked me in the cupboard. Laughed at me,” the actress told children during a speech at a charity event for WE Day UK in London on Wednesday, according to the Evening Standard.

“I felt that I wasn’t good enough. I didn’t look right, and all because I didn’t fit into someone else’s idea of ‘perfect’. I didn’t have the perfect body. And I would rarely hear anything positive.”

The 41-year-old, who has often spoken out against prescriptive body norms in the past, said not being “the prettiest” in the classroom didn’t stop her reaching for the stars, but life outside school walls proved just as tough.

Kate Winslet shared her bullying story at a We Day UK event. Source: Getty

"I was even told that I might be lucky in my acting if I was happy to settle for the fat-girl parts. [Casting agents] would say, ‘You're just not what we’re looking for Kate.’ I’d hear that a lot," she said.

Rather than locking herself away, however, she fought back and despite being the "most unlikely candidate", landed the role of Rose in Titanic, opposite her now close friend Leonardo DiCaprio.

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She said: "I had to ignore the negative comments. I had to believe in myself. I had to choose to rise above it all, and I had to work hard. You have to be indestructible to do what you love, and believe that you are worth it. And sometimes that's the hardest part.”

The mother-of-three urged the children in the room to be their "true selves", value their school years and look up from their smartphones as often as possible.

Kate and Leo looking glam at the 2016 Academy Awards. Source: Getty

“Society is changing so fast. What we value is changing so fast. It's not easy being a teenager, and it's becoming harder than ever in a world of peer pressure and such awful things as cyberbullying and exposure to unattainable aspirations.

"Share a real chat with the person sitting next to you, share stories, share being in this moment. By talking. Or with a hug.”

How did you overcome bullying?

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