Someone once told me to always live for the little things in life. Live for sunrises and sunsets where you'll see colors in the sky that don't usually belong. Live for road trips and bike rides with music in your ears and the wind in your hair.
Your are your 'selfish' years. It's a decade to immerse yourself in every single thing possible. Be selfish with your time and all the aspects of you. Tinker with shit, travel, explore, love a lot, love a little and never touch the ground.
You are invincible. You can create your own worlds/universes. Mistakes are good (as long as they don't kill you.) The answers are everywhere. Reading is crucial. And most importantly. Question everything.