When I lived with my parents, my stepmother gave me a hard time about it.
My friends understood that it was more than just a hobby, but it was a culture that I am passionate about. Having people that support your interests, rather than making you feel like some sort of fiend is very reassuring.
I am told I obsess with my fish. I just moved 2000+ miles away from a lot of friends, and my family just figures it is my way of coping with homesickness.
Don't worry about it. Some people obsess with dogs, some with cats...we with fish.