Feeling Overly Involved with Media and Celebrities

There's something I do that I don't know why. I feel over involved with media, characters and celebrities. I feel intrinsically tied to certain things, as if they are a part of me. It's to the point that when another person claims to know or like that thing more than me, I get upset. I don't lash out at other people or come for them but I have on occasion become overly defensive over these things. I know that I don't own shows, characters or celebrities but I don't know why I can't stop myself from feeling this way. I feel like every behavior must have a reason right? This is bothersome because I am not a stranger to crying over something someone said about a character I feel tied to.