Careful, music people... you may be running down and chasing off potential 'real' fans. After all, there was one point in your fandom when you only knew one song or one cd by the bands you love, but since no one made you feel bad or stupid for being that way, you kept learning more about the bands, and getting in to more of their stuff. If they like the new stuff, why not try to turn them on to some of the old stuff, or more stuff from the band? You may be discouraging people who could potentially be great concert buds, or who have similar enough tastes musically to turn you on to something new you'd love but don't know about yet.

As far as the clothes go, I think it is worse to give up something you really like just because other people like it, too. I think not liking something just because other people do is even worse than liking it because other people do. If you really want to be yourself and be an individual, than forget about all the trends. Don't even let them register with you. There's no rule that says you can't incorporate both the most popular and the not-even-on-the-map-yet things into your style. It's all good, as long as it is what you like and what makes you feel good.