ELI5 answer: It was hard to distinguish the letter I from other letters, so they started making it longer and longer until it became a capital letter. The rules for capitalization weren’t created until the 1700’s. Here are some links that explain this a bit better.
[https://www.thesaurus.com/e/grammar/whycapitali/](https://www.thesaurus.com/e/grammar/whycapitali/)
[https://grammar.yourdictionary.com/parts-of-speech/pronouns/list-of-personal-pronouns.html](https://grammar.yourdictionary.com/parts-of-speech/pronouns/list-of-personal-pronouns.html)
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