Long time ago I took a personality assessment for the sake of knowing myself better. The result for me turned out to be INTJ. And now it seems unchanged.

Introverted (I) 66.67% Extroverted (E) 33.33%
Intuitive (N) 58.33% Sensing (S) 41.67%
Thinking (T) 70.59% Feeling (F) 29.41%
Judging (J) 51.52% Perceiving (P) 48.48%

Free Jung Personality Test (similar to Myers-Briggs)

INTJ – “Mastermind”.

Introverted intellectual with a preference for finding certainty. A builder of systems and the applier of theoretical models. 2.1% of total population.

loner, more interested in intellectual pursuits than relationships or family, not very altruistic, not very complimentary, would rather be friendless than jobless, observer, values solitude, perfectionist, detached, private, not much fun, hidden, skeptical, does not like most people, socially uncomfortable, not physically affectionate, unhappy, does not talk about feelings, hard to impress, analytical, likes esoteric things, pessimistic, not spontaneous, discontented, guarded, does not think they are weird but others do, responsible, insensitive to the misfortunes of others, orderly, clean, organized, familiar with darkside, does not value organized religion, suspicious of others, lonely, rarely shows anger, punctual, finisher, prepared

favored careers:
scientist, dictator, forensic anthropologist, systems analyst, philosopher, nuclear engineer, political analyst, researcher, statistician, scholar, research scientist, computer scientist, software designer, curator, computer programmer, aerospace engineer, electrical engineer, paleontologist, english professor, philosophy professor, chemical engineer, epidemiologist, forensic scientist, museum curator, research assistant, mechanic, astronomer, figher pilot, librarian, systems administrator, neurosurgeon, book editor, biotechnology, archeologist, lab tech, bookstore owner

disfavored careers:
advertising executive, job in entertainment industry, performer, singer, art therapist, childcare worker, bartender, dj, even coordinator, hair dresser, wedding planner