Thank you for sharing this story with us!
I especially like the part how you were convinced that you sister won't write as in mirror - and she did it her way.
When you look at this video, you'll see that Paul holds his bass the opposite way from George & John:
But that isn't the 'wrong' way - for Paul, it is the right way because he's left-handed and playing the bass like that suits him.
From a leftie point of you, we could say that the other two Beatle guys hold their guitars 'the wrong
Majority of people are right-handed, so when they forcing someone (at school) to not be his true self (leftie), that's opression and that's similar as if you would forbid someone to wear glasses because
most people don't wear or don't need them.
Oh yes - the glassess - I guess I didn't like them at first. I didn't want to wear them at school because there was hardly anyone of the kids who had glasses.