This song could have many possible interpretations. When I first heard it, I knew right off the bat it was about self harm. The line "paint yourself a picture of what you wish you looked like, maybe then they just might feel an ounce of your pain" I believe, has it do with eating disorders and how people who suffer from that, may portray a horribly underweight body type as perfect, and 'normal' people wouldn't find that okay. The next line; "come into focus, step out of the shadows. It's a loosing battle, there's no need to be ashamed" has to do with the scars that these poor people would be baring. And then "they don't even know you, all they see is scars; they don't see the angel living in your heart". This one for me, was the dead giveaway. What they mean by this, is that people will judge you by the outside, but they really don't know how lovely of a person you are in the heart, therefore you should not be discouraged when people who don't know you, look down on you for your appearance, in the case; your skin.