Well you could try a few different things. First of all, the best thing would be to get a job (or if you already have one) and rent an apartment or even a hotel room short term. But you could always call relatives or friends and see if you could stay with them. Or you could also check out couch surfing (
www.couchsurfing.com) which lets you stay on someone's couch for free, although you probably couldn't realistically stay in one place for more than a few nights. But you could always go on a trip or something idk. If you have a car you could maybe sleep in the car for a few nights? There aren't really any long term solutions since unfortunately everything requires money in this world :/ but good luck!
參考: I'm 17 - thought about this quite a bit as well!