I like science because it still works when I'm depressed.
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It's very difficult for me to explain to exceptionally perceptive people why I'm pursuing enviro tech. They don't typically settle for "because I love nature and we need to take care of it." As true as that is, there are other ways to help the environment that seem more fitting other than becoming a technician.
     By strong preference I am more of an artistic person, but when I'm most depressed it just feels impossible to truly get into it. Whether its music, or writing, or visual art, when I force it seeing the results makes me feel worse because it feels like I should be doing better. It's like negative reaffirmation of "yes, you are at a low and suck right now, indeed." And it makes me feel more afraid that I won't be able to get out of it this time.