I pursued a formal diagnosis despite the fact that I essentially already knew because I wanted verification. I do not like leaving things up to chance.
I wanted to have a concrete answer from someone trained to recognize the signs that explained my gifts and limitations. My family thought this would make me angry, because I might look back and think, "Would things have been better if I had pursued a diagnosis earlier?" But nothing could be further from what I feel now. I have a reason. None of what I know is the result of a bunch of converging coincidences that sometimes seemed like bad luck or a freakish talent, but part of me being on the spectrum.
I hope this helps.