First i would help my family financially
Then i would help my "old" (as in i no longer live there) friends out of their grave of a life
Then i would drop out of the university, pay off all my debt and build a house -> move in. Start living life freely, put enough money in the bank that would be enough for doing nothing for the rest of my life.
Then i would donate to alot of diffrent organisations.
Then i would start exploring space (Not me, but someone who would "work for me", meaning i would be the first to know what the results would be).