Kylie Jenner considers Instagram to be a ''made up world''.

The 17-year-old reality TV star doesn't take the photo-sharing social media site too seriously and insists users need to realise the images that people post are part of an existence they want to portray.

In a post on Twitter, she contemplated: ''Instagram is a made up world. I just show people what I want em to see. Doesn't everybody? (sic)''

In an earlier post Kylie was contemplating her life as a celebrity since she found fame with her family on 'Keeping Up with the Kardashians', and used a tweet to remind her followers she's not public property.

She posted: ''The public doesn't know everything about me.''

Perhaps the teenager has been in such a philosophical mood because she's been suffering from jet lag over the last week, meaning she's been awake in the small hours of the night.

She tweeted: ''Been sleeping all day & now imma be up all night #jetlag (sic)''

Kylie - who is rumoured to be dating 25-year-old rapper Tyga - has a reputation for making racy and controversial posts on her social media accounts, but she isn't really very ''wild'' in real life.

A source recently said: ''Kylie loves to feel sexy and post sexy things but she isn't that wild. She's so close with everyone that her sisters know what she's doing and who she's hanging out with.''