Willow and Jaden Smith are "two parts of one thing".
The 'Whip My Hair' singer is very close to her 17-year-old brother and though he is two years older, they feel like "identical twins" because they always know what one another is thinking.
Willow said: "We're like binary stars, like two parts of one thing. I know what he's thinking at all times. And he knows what I'm thinking. We're not identical twins, but it feels like that in a lot of ways."
The 15-year-old star - who is the daughter of Will Smith and Jada Pinkett Smith - felt "lost and super insecure" while she tried to figure out her place in the world, but things changed when she realised she needed to "create" herself.
Speaking to the new issue of Teen Vogue magazine, she said: "During that time of figuring it out, I was lost and super insecure. But then I stopped trying to find myself in these other inanimate objects, people, and ideas.
"I realised it isn't about finding yourself -- it's about creating yourself."
And Willow insists that her "crazy" clothes and make-up are just ways of expressing how she feels inside as she is always the same person, no matter how she looks.
She added: "I have some cool shoes on and I wear crazy eyeliner, but it's really all about emulating the colours you feel inside.
"A lot of clothes are cute, but after you buy the Yeezy shoes, after you get your hair done with a weave, you're still the same person.
"I feel like more and more kids are starting to realise this."