If you can't justify having something you enjoy by saying "it's not anything I can physically show some achievement for" are you sure you're doing it/quitting it for the right reasons?

I read for pleasure sometimes, it's usually not anything I can talk to anyone about since it's usually older scifi, but I wouldn't consider that a "waste of time."

Also, if you tell anyone in the age bracket of 25-35 that you beat Halo 2: LASO they'll know youve been in the trenches, it's not necessarily all for nothing if you have people that share the hobby.