"I might like making a living doing X, but I've always wanted to do Y. I'm only doing X because of Z."
- Actually, This Troper always wanted to write the unabridged version.
http://tvtropes.org/pmwiki/pmwiki.php/Laconic/CareerNotTaken
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"I might like making a living doing X, but I've always wanted to do Y. I'm only doing X because of Z."