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12. Psychologist

Median salary: $67,650
Hiring outlook (job growth through 2020): 22%

If you're a psychologist, you get paid a lot of money to study how people think and behave, and if you have a private practice, you get to make your own hours, right?

"Psychologists are on the list because they're responsible for other people's lives and well-being," Lee said. "It's a much more stressful job than people realize because of the nature of the folks you're dealing with," he said.

Image source: Alain Shroder | Onoky | Getty Images