Yeah well, I do love teaching so I guess it wouldn't really matter if its ESL or Philosophy, I'd find a way to love it. So perhaps that's my issue. I should have stopped loving!
I've always kept myself busy with non-teaching jobs like composition, mixing, writing and so forth and I guess my interests are too diverse to keep teaching kids where verbs go in a sentence... I envy your mindset =P
nononono Love the work! Don't be attached to the job!
Know that there are others, and with this work, it's easy to know!