Yep these are different codes and one of them resemble your personality very closely.
While surfing and going through different links, I was redirected to this website which was linked by someone on his personal page in order to describe his personality.
ENFPs are both “idea”-people and “people”-people, who see everyone and everything as part of an often bizarre cosmic whole. They want to both help (at least, their own definition of “help”) and be liked and admired by other people, on both an individual and a humanitarian level. They are interested in new ideas on principle, but ultimately discard most of them for one reason or another.
Similarily, ISTJ is for Introverted Sensing Thinking Judging which is described as –
ISTJs are often called inspectors. They have a keen sense of right and wrong, especially in their area of interest and/or responsibility. They are noted for devotion to duty. Punctuality is a watchword of the ISTJ. The secretary, clerk, or business(wo)man by whom others set their clocks is likely to be an ISTJ.
It happened to be very close analysis. Studies are based on psychological types based on the four functions (Feeling, Thinking, iNtuition and Sensing) and the two attitudes (Extraversion and Introversion).
After going through all the types, I found one suitable code for myself (although I wasn’t much convinced from the full form but the description closely matched my personality). It is INTJ (Introverted iNtuitive Thinking Judging) which is explained like –
To outsiders, INTJs may appear to project an aura of “definiteness”, of self-confidence. This self-confidence, sometimes mistaken for simple arrogance by the less decisive, is actually of a very specific rather than a general nature; its source lies in the specialized knowledge systems that most INTJs start building at an early age. When it comes to their own areas of expertise — and INTJs can have several — they will be able to tell you almost immediately whether or not they can help you, and if so, how. INTJs know what they know, and perhaps still more importantly, they know what they don’t know.
INTJs are perfectionists, with a seemingly endless capacity for improving upon anything that takes their interest. What prevents them from becoming chronically bogged down in this pursuit of perfection is the pragmatism so characteristic of the type: INTJs apply (often ruthlessly) the criterion “Does it work?” to everything from their own research efforts to the prevailing social norms. This in turn produces an unusual independence of mind, freeing the INTJ from the constraints of authority, convention, or sentiment for its own sake.
A website worth visiting if you are a patient reader and want to know more about your personality. You can visit it at – www.typelogic.com. Otherwise there are online tests @ Google