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.
Because to at least one person, you're going to be absolute perfection and they're going to fall in love with you. But before they do, don't be afraid to fall in love with yourself. Just because there are people prettier than you doesn't mean you're ugly.