My handed-ness is a secret to me mostly.
That's one people react freaked out to.
I assume that is because handedness is something most people think you know naturally.
Raised to use my right-hands because of no preference but can do each task that does not need to be learnt as well with my left hand and take as long with my left hand to learn these tasks as with my right hand.
I also write wonderfully with my left hand and a left-hand pen.
I now prefer that, because my writing is nicer and better looking to me, though unreadable to others (whereas my writing with my right hand is liked by others and easy to read for them, but unreadable to me).
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett