My personality is INTJ, which is:

The INTJ personality type is one of the rarest and most interesting types – comprising only about 2% of the U.S. population. INTJs are often seen as highly intelligent and perplexingly mysterious. INTJ personalities radiate self-confidence, relying on their huge archive of knowledge spanning many different topics and areas. INTJs usually begin to develop that knowledge in early childhood (the “bookworm” nickname is quite common among INTJs) and keep on doing that later on in life.