Margot Robbie didn't think she was a good actor until one specific movie

Margot Robbie says she didn't think she was a good actor until watching back one of her movies.

That statement might seem a bit strange, considering the fact the Australian is one of the biggest names on planet Earth.

Since her big break in the long-running series Neighbours back in the day, the 32-year-old has gone on to star in the likes of The Wolf of Wall Street, The Big Short, Suicide Squad, and Bombshell.

Robbie recently became the youngest ever actor to be given a special 'BAFTA: A Life in Pictures' tribute.

However, despite all of her early success, she opened up about her own anxieties and lack of confidence about her ability.

Speaking to the audience at the event, she said that it was only when she watched back her 2017 release I, Tonya that she really believed she was a decent actor.

"I, Tonya was the first time I watched a movie and went, ‘OK, I’m a good actor’," Robbie said.

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"I thought, 'Okay, I'm ready to reach out to my idols'. And that's when I wrote the letter to Quentin (Tarantino)."

And that led to her being cast as Sharon Tate in the hit movie Once Upon A Time In Hollywood.

For those of you who aren't familiar with the hit film, I, Tonya told the story of figure skater Tonya Harding, who became the first American woman to complete a triple axel during a competition.

A synopsis reads: "In 1994, her world comes crashing down when her ex-husband conspires to injure Nancy Kerrigan, a fellow Olympic hopeful, in a poorly conceived attack that forces the young woman to withdraw from the national championship.

"Harding's life and legacy instantly become tarnished as she's forever associated with one of the most infamous scandals in sports history."

Speaking previously about the performance, which saw her nominated for an Oscar, Robbie said it took over her life.

At times, she actually thought she was Tonya, forgetting that it was just a film, and she even punched her on screen husband in the head, thinking that she was in a real argument.

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She recalled: ''I had lost my mind. I genuinely thought we were these people and we were off the set, running down the street screaming at each other and the cameras are running after us. I think I was screaming something about needing to go to hospital because my hand was broken.

''It wasn't, but I was so caught up in the moment. And Sebastian was like, 'Margot, where are you going?' He went to pick me up because I was continuing to tear down off set and I turned and punched him in the head."

Despite the film crew stopping the cameras because they were so concerned by her behaviour, Margot claims she found the whole thing pretty exhilarating.

''A few times I've genuinely thought I wasn't on set and that I was that character in that time and in that place. To truly forget there's a camera in your face is really hard. When it does happen, it's really exhilarating. I don't know if it's because you're so tired when you're filming you're almost delusional.''