Absolutely. You are always a sheep in some regard; non-conforming in every regard is an exhausting and worthless endeavor. Not to mention, you almost have to pay more attention to trends than the unconscious conformer, at which point... who is the slave to trends?
I find the whole idea of using "sheep" as a shorthand for adherence to social norms to be immature. To me it smacks of the adolescent impulse to distinguish oneself from one's parents, and by extension, from any perceived authority--social or otherwise. It's not a great long-term strategy, but it satisfies an emotional need.
Actively defying the norm for its own sake is counterproductive. If your choices are based directly on trends by actively pushing against every one of them you notice your still a slave to them.
Everyone is unique if you only count the things that make them different, and people are pretty similar if you look for things that make them alike.