People have asked me: is there a test I can take online to find out my Myers-Briggs type?
Here is a popular test (72 questions) and here's another (48 questions).
I took the former test and came out an INTJ (actually I'm a little more P than J). I then took the second test which scored me correctly as INTP and got the strengths of each "letter" broadly right too. So I'd recommend to take both tests but maybe the second works better.
See also the general resource survey site here.