Im 16 and im planning to go Solo on Tokyo next year, Wdyt

Im from Korea, currently 16
Currently wanna go Japan next year for few reasons
Since it only takes 2 hours with Flights from Korea to Tokyo I planned Two day, one night trip, since I only have 2 places to visit.
However, I just knew that they mostly dont allow Kid to stay at hotel alone..
Now im thinking of sleeping at Haneda airport for few hours after my tour of Day 1… do you think that's stupid? Are there any chances to get kicked out? Or maybe any chance to get in thru hotels etc? Need yall help.