I've also got to address something else, the use of otaku. I used to use it a lot and I actually stopped as soon as I found out what it meant.
Copy pasta definition for those who don't know...
"'Otaku is the honorific word of Taku (home).
Otaku is extremely negative in meaning as it is used to refer to someone who stays at home all the time and doesn't have a life (no social life, no love life, etc)
Usually an otaku person has nothing better to do with their life so they pass the time by watching anime, playing videogames, surfing the internet (otaku is also used to refer to a nerd/hacker/programmer).
In the Western culture, people confuse otaku to be something positive like "Guru". If you think about it, it's not really good to be called a guru if it means you are a total loser who can't socialize with other people except through the Internet.
Other Japanese words which have been confused by Westerners also include but not limited to: Anime, Manga, etc"
Just so the people who don't know do now. I'm not trying to force you to use other words, but if you want to be referred as a shut-in then, by all means, keep using the word. If not it would probably be a much more accurate of description of your personality to use the words "anime fan".