I'm nearing 36 and I've been gaming since the Intellivision. I've had periods where I gamed up to 30-40 hours per week, and periods where I haven't gamed at all for several months. I don't think I gamed at all my entire first year of college. I was so busy with trying to absorb everything college had to offer (I'm not talking just parties and classes) that I just sort of left gaming alone for that whole year. I didn't really pick it up with any sort of regularity again until after grad school.
As others have mentioned, it sounds like you're seeing other options for activities around you in college. Backing off of gaming doesn't have to mean that you see gaming as immature or childish; it just might mean that you have found new interests for the time being that you also enjoy.
This is just my opinion, but I think that spending more time in other activities in college is a fabulous thing. At no other time in your life will you be presented with such a wide variety of social, academic, cultural, political, philosophical, and spiritual activities all at once. Take advantage of those options and explore new things.
Gaming will still be around should the passion for gaming return. If it doesn't, please don't feel like you've lost part of you. Many of us had different passions in our younger years, but they get replaced with new passions. It doesn't mean we're having less fun; it just means we've found new things that amuse us.
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