I don’t know why people use the word fan or fanboy so lightly :?
I hope this makes you think twice before calling yourself a fan boy 8O
A fan or supporter is someone who has an intense, occasionally overwhelming liking of a sporting club, person, group of persons, company, product, work of art, idea, or trend. Fans of a particular thing constitute its fanbase or fandom. They may start a fan club, hold fan conventions, create fanzines, write fan mail, or engage in similar activities.
In some cases, individual fans may become so obsessed with the objects of their infatuation that they become fanboys/fangirls. These fans engage in behaviors that are considered extreme or abnormal. This includes idolatry or other forms of worship, such as creating a personal shrine dedicated to the idol at one's home, and can sometimes extend to the point of the fans become stalkers.
Fanboy or fanboi is a term used to describe an individual (usually male, though the feminine version fangirl may be used for females) who is utterly devoted to a single fannish subject, or to a single point of view within that subject, often to the point where it is considered an obsession. Fanboys remain loyal to their particular obsession, disregarding any factors that differ from their point of view. They are also typically hateful to the opposing brand or competition of their obsession regardless of its merits or achievements.