I was left-handed when I was a child. As a result, because the school forced me to write with my right hand, I changed to my left hand. However, because Catholicism and Christianity no longer have absolute political control in the west, the reform of the education system is not so strict in this respect (it was illegal for these religions to write with their left hands when they held the real power of the country)

Another reason is what I think now: because the left and right letters are similar, but our Chinese is more difficult to write, so in order to read, we write with our right hand, haha.

I hope you are satisfied with this answer.