Karrah,
Just because you're attracted to bigger guys doesn't mean there is anything wrong with you! Think of all the married people who must post on this site! If it weren't for the "chubby chasers" these people may never have found true love.
My thin friend Maggie for example, has a tendency to go for big chubby guys. She just likes them! They make her feel...ummm...safe.
I say go for what you like! If you are attracted to fat dudes, then more power to ya! Fat guys need lovin' too.