I had that dilemma, too, and what helped me was digging into my core self and finding that ONE, single most important, higher purpose of my life. From there on, I started to read about the functions again and saw that I used Ni without doubt, and loads of Ti, while the Fe was heavily suppressed. My life wish or purpose, however, clearly implies helping HUMAN BEINGS, being with HUMAN BEINGS and spreading the wisdom I get through Ni so that humanity can be a happier place to live in 
My INTP friend is concerned about humanity as well, but more in a "why are they so freakin retarded?" kind of way, he wants them to be more rational, honest etc. He doesn't want to dedicate his life to "serve" humanity, though.
Hope that helped a little!
My INTP friend is concerned about humanity as well, but more in a "why are they so freakin retarded?" kind of way, he wants them to be more rational, honest etc. He doesn't want to dedicate his life to "serve" humanity, though.
Hope that helped a little!