Having recently married Hailey Bieber, she says she may feel uncertain and regularly stop social media from focusing on herself.
Buzzfeed's Interview revealed the pressure of industry and "surrounded by great beauty."
"I struggled with the comparison. I came from a simulation world where it is very easy to compare myself with your friends. You are simply surrounded by a lot of beauty.
"I would say that every girl is struggling to compare herself, whether in social networks or (something else)," said Haley, who is married to the singer Justin Bieber.
She added: "There will always be other women or girls that you feel uncertain or that you compare with yourself. What if it is this, and I'm not it? You always know what's going on?