Do you think you're a <insert medical, psychological condition>? Are you? Why?

As prompted to by a fluther friend. A discussion about labeling, and becoming labels.

You have been diagnosed with: depression, bipolar disorder, dysthymia, schizophrenia—or any other condition – medical or not.

You have been called a person of type A or B.

Do you think you are that? How does the label help you, how does it hurt you? Where is it useful?

Please keep this related to the topic – humor is welcome. I am looking forward to a good elaborate discussion however.