The 21-year-old daughter of Christie Brinkley and Peter Cook has been struggling with what she sees in the mirror versus what’s on social media.

“I’m so f–king sick and tired of the photoshop,” she wrote on Instagram alongside a series of photos of herself in a bikini, referencing lyrics from Kendrick Lamar’s hit “Humble.”

“I’ve been so down on myself recently. Crying about my cellulite, letting the fat on my body ruin my day, getting mad that i’m not as skinny as i once was,” she explained. “The body dysmorphia and left over eating disorder tendencies have been coming in strong.”

Brinkley-Cook admitted her body’s changes have left her feeling like she’s lost all “control” and has forced her to compare herself to others.

“As i come into myself as a young woman my body shifts and changes by the month, the ‘control’ i felt i once had over it has been completely stripped away from me,” she continued. “Hormones, emotions, growing pains. I go on instagram and scroll through photos of girls that look ‘perfect’.. shiny skin with not a bump to be seen, tiny little waist and thighs that look like chopsticks. And i compare myself, as if how someone on an app on my phone looks should directly correlate to how I feel about my body?”

The model said she’s now ignoring what she sees online and instead has been focusing on what she’s grateful for — her strength and her health.

“What I’ve learned is that I run every day. I go to the gym 6 times a week. I fuel my body with beautiful food,” she explained. “I am so f–king LUCKY to have two legs and a healthy body that takes me through life.

“I’m so tired of thinking anything that makes up ME is something to be ashamed of.”

Brinkley-Cook joked then listed all of her so-called flaws, because if it’s not on Instagram it’s not real.

“So as most 21st century girls would do, I’m putting this out there on instagram,” she joked. “Declaring that I have cellulite, and a stomach that doesn’t always look ‘pleasant’ (whatever the f–k that means) and I am 100% imperfect human. And I’m proud as hell of my body!

“If you’re out there hating on yourself, stop!! Appreciate yourself. You’re body is so magical. That’s all. Have a nice day.”