You don't seem like an underachiever to me.
You seem like you always demand more from yourself, and can't be satisfied with whatever you've achieved.
If you want to entertain that hypothesis, try "Thoughts without a Thinker", a buddhist-psychology book by Mark Epstein.
I'm not a Buddhist, and I'm off Buddhist literature currently, but this book gave me a hint about trying to "be" instead of trying to "do". In order to improve yourself, you first need to understand that you cannot improve. This kind of gibberish philosophy starts to make sense after this book.
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You don't seem like an underachiever to me.
You seem like you always demand more from yourself, and can't be satisfied with whatever you've achieved.
If you want to entertain that hypothesis, try "Thoughts without a Thinker", a buddhist-psychology book by Mark Epstein.
I'm not a Buddhist, and I'm off Buddhist literature currently, but this book gave me a hint about trying to "be" instead of trying to "do". In order to improve yourself, you first need to understand that you cannot improve. This kind of gibberish philosophy starts to make sense after this book.