A friend of mine has a mental disorder (I think) but I don't know what it is. She constantly blames herself for something she had done in the past. She told me that she is an introvert, she wants to be alone most of the time. I know, I kind of understand her because I am also an introvert myself but her case, maybe, is way beyond what an introvert is. I've known her for a year now. Every time I ask her if how she's doing, she would answer me with a smile, but I know and I see the pain behind those smiles.