How did you become an INTP

[Architect]

Oh yes, it happened to me. I used to consistently test INTJ. I got profoundly depressed. Picked up philosophy and my outlook on life just changed drastically. Took the real test from psych's multiple times to determine INTP.

No it didn't. Assuming you really are an INTP, you always were an INTP. You simply changed your behavior to align with your type and found greater satisfaction, but your type didn't change.

As for testing INTJ or whatever - makes no difference. INTP's typically test as INTJ's at first. It's because we confuse having a judging dominant with being a judging type.