I would never take on the identity of anything.... I'm me. Taking on an identity is basically saying that you would be changing who you are to fit in with a certain type.

Which defeats the purpose. Both personality quizzes and personality disorders just explain who you are. The Myers-Briggs is based on questions you answer and demonstrates your perception of yourself more than anything. Personality disorders are diagnosable and not overly changeable without a lot of hard work.

If someone is diagnosed with a personality disorder, they're probably more likely to end up with a Myers-Briggs type that complements their disorder. People with Dependent personality disorder are almost certainly going to end up with a very different result than someone with Antisocial PD. They are very different personalities.