Lyric discussion by Juzo 

Cover art for Mascara lyrics by Killing Heidi

A nonconformist song. There's a message that says experience things for yourself, make your own decisions, and don't rely on the opinions of others to dictate your outlook on life. Don't be stupid, see things for yourself before forming an opinion on them. Hiding away won't change what's there, and what's commonly thought isn't a necessary truth, so leave it behind.

I think it's actually saying the opposite of this. If you listen carefully it says "wearing black wont take care of that, don't be stupid girl". This is saying that being a non-conformist, dressing in black and so forth, will not solve a single thing. It is encouraging people to snap out of it.