She kept her head high and her back straight.  They all saw her, and they all thought that she was cold as ice.  Colder, even.
But when she was alone, when no eyes were upon her, when nobody could hear her, she sobbed and sobbed and cowered.  
None of them could tell; her mask of stone was better than even she knew.
But she was scared of being alone.  No, not scared, terrified.  The fear grew and grew like a weed, over the weeks, over the months, hidden away where nobody would know, until it reached the point  where she would cry going from a deserted corridor to a full classroom, and quickly wipe away the tears before entering.
When had it started? Years ago, really.  Whenever she thought back, she couldn't remember ever being truly happy.  And it had just gotten worst and worst as the time went by.  Words, memories, thoughts, shadows, and truths accumulated in her head, and mixed into a neverending cicle of depression and fear.
She didn't remember anymore why nobody could know; all that she was sure of now was that they needed to see her as nothing more than a slab of stone, without emotion, without features.  And no matter how much she cried out for help, she only stood there without speaking as they went by, while all that she wanted to do was to yell Help me, please! Don't leave me alone, I can't bear it!
She couldn't quite remember, but she was unable to forget.  Truth blended with lie, and everything was dark and empty.  There was no help.  Nobody would hold her and stroke her and tell her that it would be okay.  Even if they did, she was sure that it wasn't true.
Whispers and shouts rang in her ears that day, and visions of a time long past filled her vision as she walked through the familiar alleys.
She reached for a knife and closed her eyes for the last time.  It was the only way she would reach a semblance of peace, and she didn't feel her blood as she waited for it to come.