A confusion of Princes by Garth Nix.

Khemri is an enhanced being – equipped with medical and technical enhancements which make him a Prince of the Empire. As an adult, he learns there are millions of princes, but only one can become Emperor and leader of the Imperial Mind. With his retinue of priests and Haddad, his Master Assassin, Khemri learns his destiny is not the same as other Princes, if only he can stay alive to discover all of it – and achieve it. As he faces physical challenges, Khemri begins to question his training. As he is expose to life outside, and some time spent as a normal human being, Khemri’s choices become even less clear-cut.
A thoughtful, thought-provoking, exploration of humanity and technology, in a Space Opera setting.
This is what science fiction is best at: making us question our lives and society now.
5 stars all the way!

If you like this, try:

• The Xenocide mission by Ben Jeapes.
• Decision at Doona by Anne McCaffrey.
• Genesis by Bernard Beckett.
• The tomorrow code by Ken Catran.
• The sky inside by Carle B. Dunkle.
• Enchantress from the stars by Sylvia Louise Engdahl.
• Ender’s game by Orson Scott Card.
• Gate to women’s country by Sheri S. Tepper. 

~  Thalia.