Get moving. Get outside. It’s good for your self esteem.
I’m not talking going to the gym and lifting or running for four hours on the treadmill. I’m talking about getting outside and walking, running, skipping, jogging, shuffling, or laying in the grass. Unplug, shut off your phone (but keep in on you in case of mutant dog attack) and just walk. Be amazed at how lucky you are that you have this body that walks and breathes and moves and exists. Yes, your right knee hurts when you run for too long and you have a big scar from where your brother pushed you out of a moving car, but your body still works.
Be amazed by the fact that you are here, the Earth is here, the world is impossibly huge, and you get to live in it. Look at the sky and marvel at how blue/grey/cloudy/clear it is. Breathe the air and inhale the scent of flowers/rain/snow/autumn/city/country.
Life can be hard and you can hate it and want to end it and wonder if it ever gets better, but just slow down, and look at how this world has survived for so long, and you can too. Think about how five years from now, you could be building a house on this plot of land, or protecting it with a historical committee, or drunkenly rolling down that hill. You could be halfway across the world, swimming to the bottom of the ocean, or flying 30,000 feet in the air. You could be studying at Harvard or traipsing around Spain.
The world will wait for you to feel better. It will still be there when you’re ready to smile and skip and taken a drunken roll down that hill.