Which figure of speech is used in this text?
Now that I'm an adult, I love my job and work hard at it. But when I was younger, I was a little motivationally challenged. I just couldn't see the payoff that might come from hard work.

 - paradox
 - euphemism
The text uses a euphemism, a polite or indirect expression that is used to de-emphasize an unpleasant topic.
Motivationally challenged is an indirect way of saying lazy.