Hi I'm an intj. They gave us the test in high school, I was that. And then a few months ago I did it twice, both times the same. However the Myers Briggs is basically full of crap, it's still kind of fun though.
I'm infp too. Don't listen to these dumb aholes. Mbti sometimes makes sense compared to horoscope or astrology. Duhh. They can't just understand well mbti.