Kendall Jenner recently opened up about her youth.

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As her modeling career continues to thrive, the model and reality star, and sister to Kim, Kourtney and Khloe Kardashian, has admitted that growing up in the public eye with her famous older sisters may not have been ideal.

"I feel like I grew up too fast a long time ago," Jenner wrote in a column for The Wall Street Journal's Feb. 2015 issue. "Having older siblings, you grow up around adults, so you mature more quickly. I saw my sisters and parents working every day, so I was pretty much brought up to be a workaholic."

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When she first arrived on the scene, Jenner was known as one of the younger sisters of the famous Kardashians. After appearing alongside them for years on Keeping Up With The Kardashians, Jenner launched a career of her own.

In the last two months, Jenner has landed two major gigs, one being a solo feature in Marc Jacobs' spring campaign, and another as the face of Estee Lauder.

"My sister Khloé always says to me and my younger sister, Kylie: You have your whole life to be an adult but only so long to be a kid. And we get it. In the right situations, I try to be as immature as I can sometimes -- react to things as if I were 12. You can't take things too seriously."

Also discussing the topic of youth for The Wall Street Journal's new issue are soccer player Tim Howard, actress Goldie Hawn, psychology professor Jeffrey Jensen Arnett, celebrity dermatologist Dr. Fredric Brandt and author Maira Kalman.

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