Most Helpful Girl
If you want to do it, then do it. Don't take what other people think so serious that it would affect something you are interested in. Some people won't like, some won't care, some may like it. In the end, their preference should not impact what you want to do... :)
Most Helpful Guy
If you seriously want to paint your nails and withhold the consequential bullying for it, then go for it. But is it really worth it? I vote for no. Some forms of self-expression are less important than physical well-being. I don't trust the typical extroverts and their ability to withhold physical aggression.