The generally accepted linguistic explanation for the capital “I” is that it could not stand alone, uncapitalized, as a single letter, which allows for the possibility that early manuscripts and typography played a major role in shaping the national character of English-speaking countries.

So what effect has capitalizing “I” but not “you” — or any other pronoun — had on English speakers? It’s impossible to know, but perhaps our individualistic, workaholic society would be more rooted in community and quality and less focused on money and success if we each thought of ourselves as a small “i” with a sweet little dot. There have, of course, been plenty of rich and dominant cultures throughout history that have gotten by just fine without capitalizing the first-person pronoun or ever writing it down at all. There have also been cultures that committed atrocities even while capitalizing “you.”

oooo a semiotics lessons!

One of the most misleading representational techniques in our language is the use of the word ' I '.
Ludwig Wittgenstein

One divergence stems from the Rastafarians, who intentionally developed a dialect of Jamaican Creole in order to break culturally from the English-speaking imperialists who once enslaved them. Their phrase “I and I” can be used in place of “I,” “we” or Rastafarians as a group, but generally expresses the oneness of the speaker with God and all people. “I and I” is thus, in some ways, a conscious deviation — really the exact opposite of the English ego-centered capital “I.”

i is an Other.