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gender memories (+)
One of my earliest sources of validation was playing Kahoot in my spanish class 11th grade year. I'd always put in my name as "KitTheKitsune" (this was back while I was thinking of going with Kit as my name). It was always nice. Eventually, iirc, I started dropping "TheKitsune" and just putting my name as Kit. It was really really nice. Mind you, this was after my teacher emphatically declared we had to use our "real name". She never really cared about me doing this, though.
gender memories (+)
Another interesting source of validation back then was when I started learning Dutch. One of the earliest sentences I figured out was "Ik ben een vrouw," "I am a woman." It was nice to be able to reaffirm that to myself without giving it away to others. (Incidentally, another sentence I figured out was "Ik ben een sinaasappel." I'll leave it to you to figure out what that one means.)