Kylie Jenner's unhappy personal life: Reality star crying uncontrollably over Caitlyn and Tyga cheating rumours

American reality television star Kylie Jenner is reportedly unhappy in her personal life.

According to a report in Hollywood Life, the 17-year-old Keeping Up With The Kardashians star is troubled by Caitlyn and Kris Jenners' divorce, the 65-year-old former Olympian's transition, and her boyfriend Tyga's alleged affair with transgender porn star Mia Isabella.

"Kylie is a real cool customer in public. She is a lot like her mom [Kris] in that it seems as though nothing phases her at all," a source told the website. "She's very good at putting herself together and projecting an image of total confidence. She makes it seems like she's the happiest person in the world."

"The truth is that when the cameras are off and she isn't posting playful Snapchats, Kylie is struggling with all the drama in her life," the insider added. "She has been through more in her young life than most 17-year-old girls and it can really get to her."

"Kylie battles bouts of uncontrollable crying and sadness. She was always dependent on Bruce but now everything has changed. She's so happy and supportive for Caitlyn, but it's incredibly difficult," the source continued.

It was previously reported that the Kardashian clan is no longer keen on the relationship, as they believe that Tyga is a bad influence on Kylie.

"Her relationship with Tyga has been really stressful too," the insider said. "And now she's getting an onslaught of Internet trolls hating on her because of the accusations that he's been cheating on her with a transgender woman."