Started off with online tests, moved onto MBTI resources online and forums. For a while I was questioning whether or not I was an INFP, but after some reading on INFP's dominant function, meeting and spending a lot of time with my ENFP friend, I've realized that I just really don't relate to Fi.
Then I thought maybe I'm a tame ENTP, just because my Ne can be pretty rampant at times, but the differences between myself and my ENTP friend are quite pronounced, mainly due to the fact that my Ti is more developed than his, and he relies on Ne more heavily than I do (even when I'm letting loose in social contexts I'm still quite deliberate with my words, for example).
So, for now, I'm content with saying that I test as an INTP with a well developed secondary function.