Having two or more (or in some cases all) of the following phases; Punk, crust punk, rockabilly, psychobilly, vegan, indie, hipster, hippie, metalhead, fail-goth, gay, bi, lesbian.
But never remaining any of these for more than a couple years.
Saying things like "I hate this little town, I'm moving to Portland."
Having parents that offer to support you, and a car, yet you ride a bicycle everywhere and eat food that was recovered from dumpsters to maintain "status." People from different cities will find that ironic. You won't understand why.
Throwing a shit-fit when someone else gets a haircut similar to yours, or dyes it the same color. This symptom is particularly prevalent in females. It is a serious threat to your uniqueness. You will complain for weeks, but eventually change your hairstyle out of pride.