16 personalities is like a Big5 test disguised as MBTI, I advice to not use it
According to Wikipedia the Big 5 is more scientific than MBTI, so that's good, right?
Also an INTJ btw and I found the result to be very accurate. Not surprising at all since I already had myself figured out long before the test.
If you demand respect or gratitude for your volunteer work, you're doing volunteering wrong.