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August 17, 2015 at 07:39 PM EDT

Cara Delevingne’s already been keeping herself busy with films — she recently starred in Paper Towns and will next appear in Pan — but she recently told London’s The Times that she’s officially “not doing fashion work any more,” PEOPLE reports.

“It didn’t make me grow at all as a human being,” she told The Times, referring to her years-long modeling career. “And I kind of forgot how young I was. I felt so old.”

Delevingne, now 23, has been modeling for more than a decade, but found major success after appearing in a 2011 Burberry campaign alongside Eddie Redmayne. Since then, she’s been the face of multiple brands including H&M, Chanel, and Tom Ford — but her experiences haven’t always been positive, such as when she was asked to do suggestive poses as a teen.

“I am a bit of a feminist and it makes me feel sick,” she said. “It’s horrible and it’s disgusting. [We’re talking about] young girls. You start when you are really young and you do, you get subjected to … not great stuff.”

Now that Delevingne is focusing more on her film career though, she says she has become “very good at standing up for” herself: “I am a lot harder than I was and I feel like all of that modeling, life, rejection, everything, was preparation for this, and now that I am doing this I am the happiest person in the whole world.”

Read more over at PEOPLEand see Delevingne in Paper Townsout now.

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