[sbacic]

I expect I'll get a lot of flak for this one, but I'd like to suggest the "4 hour work week" by Tim Ferriss. I've read it at about the same age and it had a profound effect on me.

Another book I'd suggest is the Enchiridion of Epictetus. If you ever intend to have kids, "Summerhill" by A.S.Neill is a good choice.