When doing what you "love" undermines well-being and performance
Many are quick to advocate that the key to happiness is finding something you can't live without. But the research shows otherwise: Overly identifying with some kinds of passion can be unhealthy and detrimental to performance in the long run.
The term passion in common usage can describe a variety of experiences. Consider a school teacher who might feel more alive when he's practicing watercolors than when he's inside the classroom. That kind of passion is markedly different from that of an artist like van Gogh, who forswore all semblance of a normal life so he could hone his life's craft. But social psychology didn't begin measuring an individual's relationship to the things he loves to do until Robert J. Vallerand, a professor at the University of Quebec, first proposed the Dualistic Model of Passion in 2003.
Vallerand devised the Passion Scale, a way to measure one's attitude towards the few activities we engage in enough to consider a true passion.
Those with harmonious passion really love something, but ultimately can leave it, since it's a "significant but not overwhelming part of their identity." Harmonious passion doesn't interfere with other aspects of life, like relationships or education. In contrast, obsessive passion resides in individuals who derive their self-esteem and identity primarily from their performance during the activity itself. Internalizing the activity exacts many costs. A lousy day on the basketball court threatens to undermine an obsessively passionate player's entire identity.