What mental illness does this sound like to you?

*Very reclusive (spends 90% of their time completely alone).
*Has been depressed for 3-4 years.
*Doesn't have any friends, and doesn't care to make them.
*Continuously gets vivid flashbacks to their childhood, even of memories they've forgotten.
*Hates hearing loud noises, as it reminds them of domestic violence. Sometimes they get angry, and sometimes they cry and cover their ears. Most times, though, they show absolutely no emotion (and feels no emotions).
*Constant feeling of numbness.
*Enjoys the feeling of cutting.
*Often expressionless on the outside (stares at teachers instead of responding to their direct question).
*Difficulty remembering basic things and concentrating on simple tasks. They know what needs to be done but doesn't do it.

I'll update this is I can think of any others. Thanks for your responses. :)
Updates
+1 y
*When hearing of an 11 year-old who died in a car crash two days ago, they had no emotional reaction to it, even though they know her older sister.
*They dream of death and wish to see what happens when we die.
*Last year, they told a counselor they thought they might be schizophrenic (they heard voices), but it was just from stress.
*The thought of bleeding to death doesn't seem so scary anymore.

by the way, the thing about the domestic violence was a traumatic experience.
What mental illness does this sound like to you?
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