Why is the word 'I' capitalised? The only other personal pronoun receiving such treatment is 'Him'. Does this mean English speakers equate themselves with Him? Why don't they say You?
The answer to be found online is that in manuscripts the small i, on its own, was too easily misread or attached to other words, so they started using a capital I instead. This may be the same reason that Spanish uses ‹y› ("and"), rather than ‹i›, even though y is normally not used as a vowel in Spanish.