Doesn't help that once you've learned to write reasonably well with a pencil you have to start using some of the most horrendous writing instruments ever developed.
The fibre tip pen. Absolute agony to use, as it's tip scratches across the cheap fibrous paper schools use.
The fountain pen. Even more agonising. The cheap fountain pens provided by the school had nasty machined nibs with lots of rough edges that scratched even worse than the fibre tips.
At high school I could finally chose what I used to write (so long as it was ink) so I ended up using good quality rollerballs. Handwriting was still unreadable by anyone, as I'd never learned cursive properly. I lost a couple of excercise books on purpose, rather than have teachers complain constantly about my handwriting, and have my exercise books to use as evidence when they wanted to complain about my work. In sixth form I gave up on cursive, and now my handwriting consists of the minimum number of strokes needed to form each letter. It's very readable, but slow compared to cursive.
A few years ago I took an art foundation course at college, and the art history part consisted of writing a 4000 word essay every week (the usual read the book, write it out crap where somehow you're supposed to learn stuff as it goes from eyes to hand). They wouldn't accept typed work, only hand written. I stopped doing the essays, then stopped going to the art history lectures, then dropped out.
Now when I have to write (something that can't be/isn't worth ^C/^Ving) I use a pencil.
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You aren't thinking or really existing unless you're willing to risk even your own sanity in the judgment of your existence.