Unironically, how do you stop hating yourself? And don't say "just do it" like we're in a Nike ad or something

Understand what you are. You didn't just pop into existence without an origin. Your ancestors were oogabooga cavepeople who had to fight dinosaurs and disasters to survive. They endured where countless bloodlines ended. Their endurance has lead us to be the dominant species of this planet. You are their legacy, you are the apex, wear it with pride. Your brain is a tool under your mind's command that has been forged and sharpened over the course of millions of years since the primordial stew of amino acids from whence it came. Life is cruel, unfair, and hard. To endure hardship is your birthright. Your body is a fortress, your mind is a sword. You have the power to manifest will into reality that can influence the world around you. Once you understand this and draw strength from it, then you will be ready to take the next step. Should you stumble or doubt, remember where you come from and stand again.