Anthony Bourdain's Texts: “I Hate My Fans. I Hate Being Famous. I Hate My Job”
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Wait. That isn't what estranged means?
It can also connote that they're not friendly or close. I wouldn't have used it there, but without it it's not clear that they were separated at the time he wrote that letter. I personally would only use "estranged" when the people aren't friendly, but it's not incorrect as written.
I have some of the same tendencies toward inwardness and discomfort. He reminds me to fight for myself. I don't want to end up like him.