Dear Cervantes, i highly recommend a very well known russian author who is appreciated as a thorough observer of the human psyche and personality... Fyodor Dostoevsky, whom you can find right here on this web page, at
http://www.literaturepage.com/authors/F ... evsky.html
So...enjoy your reading...and search any reviews, articles or books that have been written about his work.

I personally advice you to look into psychoanalysis, as you may learn many interesting ideas, explained from a psychologist's point of view.
Regards, Roxana.