After spending some time with Sagan, you may find Kant's argument against only thinking analytically rather refreshing. Your feelings and intuitions do matter (and in your 20s, you have a lot of them). He's a fan of a metaphysical understanding of the world and has some pretty good points to back it up.
The 11 Best Psychology and Philosophy Books of 2011
You Are Not So Smart: Why You Have Too Many Friends on Facebook, Why Your Memory Is Mostly Fiction, and 46 Other Ways You’re Deluding Yourself — an illuminating and just the right magnitude of uncomfortable almanac of some of the most prevalent and enduring lies we tell ourselves. Source brain Pickings
"This book probably predates the self-help genre, but it has a very modern, zen quality that I love. It's also the voice of another generation, which I find to be super fresh and original. Finally, my dad recommended it to me, which is a great reason for me to read anything." — Anne Cassard, design project manager
10 Mind-Blowing Books That People Who Love Thinking Can’t Miss
‘Philosophy: The Pursuit of Wisdom’ by Louis P. Pojman “In a sense, philosophy is just hard thinking about the important issues of life.” ~ This sounds like a good remembrance of what I think I learned in college. lol ih