Model and Keeping Up With The Kardashians star Kendall Jenner has said she feels that she grew up too fast.

The 19-year-old, who has appeared on Keeping Up With The Kardashians since she was 12-years-old, told WSJ, "I feel like I grew up too fast a long time ago.

"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. But I just turned 19 a couple weeks ago, and I’m scared to be 20 - it’s the first step out of being a teenager."

She added, "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. I just laugh thinking about my dad [Bruce Jenner] being a teenager, partying. It’s the funniest thing. And it makes me think—what am I going to be like when I’m 65?"