If this were an anime I'd head to the nearest onsen. In reality, I'd steal a punching bag, a ton of giant bottles of whey protein powder, a cool watch, maybe some books, a pile of beef jerky, maybe follow some people I know from school home and steal their weed. Also, steal aged scotch, some beer( Guinness, Richard red, Amsterdam), cuban rum. I wanna try LSD and iowaska too. Sneak aboard planes and travel the world. Hunt animals for food completely invisible in the wilds of Africa. Live it up for a bit before I tell doctors and my father about it. Look for a cure, hope one is found so I can have a relationship. Bang older (30ish) prostitutes whose services I paid for Germany by sneaking aboard planes in the meantime, or forever if there's no cure. Make the most of my lonely life, be a not completely morally bankrupt hedonist and attempt to make myself known somehow, leave something behind.
One day you find a fully alert grizzly bear inexplicably seated upright and buckled into the back seat of your car. The doors are locked, it's almost impossible that it got in on it's own, what do you do?