if there is no specific reason that a diagnosis would help, and you don't really want it on your medical records. i would say no. unless you feel it would somehow benefit you personally.
as the above poster said, some people feel a diagnosis allows them to come to terms with certain aspects of themselves.
in my specific case as a mature student, it meant i could access invaluable assistance that without a diagnosis would not have been available to me, and without which i would have serious difficulty getting through a university course.
being in the uk, (this may depend to some degree on where exactly you are) the process of getting diagnosed is relatively straight forward. in my own case, i contacted an autism resource centre near where i was living at the time, and just took it from there. never even had to speak to my GP.
but regardless of how you intend to proceed, good luck...
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?Civil government, so far as it is instituted for the security of property, is in reality instituted for the defense of the rich against the poor, or of those who have some property against those who have none at all.?
Adam Smith