Do you want to be recognized by everyone you know? Of course!! YOU can singlehandedly have conformity eat your dust.

[edit] Steps

Fashion is crud. Style is what really matters. Never wear things because somebody else is wearing it. If you want to be different, then you have to be your own role model.
Be outgoing. Some people may be intimidated by your newfound uniqueness, but don't let that get you down. There will be people who like your utter disdain for anything popular.
Do things you like. You might even want to look for strange new activities that you've never heard of.

[edit] Tips

Be different, but always be yourself. You may loathe popular things, but always keep your mind open for things you truly like.
Don't care about what people think of you, but don't ignore it. If someone dislikes you because you're "Emo", "preppy" or hangout with certain people, don't care for them. But if someone dislikes you because they think you're jerk, because you do in fact act rude or come off as that, pay attention to that. Try to tone down or change whatever unfriendly vibe you might be giving off. Apologize, or try to talk to the person to solve the problem and explain you weren't trying to be like that.