How does one become benevolent and serious?

I am a senior in high school, and I have several qualms with some of my activities. An example of this is how I turn the lights off when I exit the bathroom weekly (especially when there are alot of people in there). I do this just because I need to blow off some steam, and I think it is funny. Do I need to become serious, or is this healthy? I would appreciate an extensive variety, that is, a plethora, of answers.