Obsessions

One of the most mysterious things I have always struggled with is obsessional behavior. This behavior of mine resembles autism, but I lack other symptoms of that group of disorders, I think, so I do not know why I act this way. My most famous obsession is birds. This started in Junior High school. I was compelled to memorize all the names, and thought about birds all day long. I still love birds, but not to this extent anymore. I have also gotten obsessed about video games, to the point where my entire day might revolve around paying the game or thinking about the game. I have written stories, did art, and I have even authored a few internet guides for my favorite games. It's like I fall in love with something and can't stop doing it. I have been told that this is within normal behavior, but I doubt it because of the intensity of my behavior.