What does it mean when someone says "I'm a waste of paint"?

Emily

New member
Yesterday on facebook my friend wrote "I'm a waste of paint" as her status. Today she came into school with a piece of cloth around her wrist, and it fell off in English. The boy who sits behind us saw what was under it and started asking if she was happy and she replied yes. I hadn't seen what had happened, but then later it slip down again and I saw cuts in perfect straight lines on her wrist. I asked her if she was okay and she looked away and said "My cat scratched me". It didn't look like her cat scratched her. I'm worried does anyone know if this means something?
 
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