It's true. I liked Pearl Jam and listened to that orange CD (can't remember if it was Ten or Vs.) a bunch but wouldn't admit because the other kids listening to it were the dirty nerdy kids, and yeah- not me.
The next person is totally guilty of overdressing for an innocuous event. Tucking in the shirt and wearing trousers not pants or jeans for a guy (or heck, tucking in a shirt with jeans!), or if you're a gal throwing on the statement dress when something else would have worked. Don't forget the shoes, it's so easy to go overboard there, and you did it. For a trip with friends to a restaurant or even an outing at a bar. You're that person.
Revel in your guilt, you were the hottest person in the room.