You are completely in the wrong and everyone in this thread is just trying to protect your feelings. This is an act of the worst order. In fact, the only thing you can possibly do to make ammends is to mail me the signed helmet and then continue to go to the stadium while dressing and acting as you were before. Only that can restore balance to the universe.
(There's a long, long history in football of fans wearing their teams colors for every team under the sun. Teams that have no native connection. It's a big stretch. You are just showing your love for the team and screaming for a little attention. Nothing wrong with it at all. Still, if it will salve your feelings, you can send me the helmet.)