Some of this practically mirrors me, but not quite identically.
My mind as opposed to going blank instead won't shut up (think Navi from the Zelda series), pre-Zinc it being like a swarm of multiples of the same voice all talking into one microphone. My "didn't feel anything toward people" tends to be your case until I notice that I risk or am losing them (moving away, becoming too paranoid to be around me, etc). I also have trouble with concentration, but moreso because I need a lot of stimulus, or else I end up too distracted by mental tangents to pay attention. Part of why I grew obsessed with studying people was because it was a way to help myself concentrate, since without it they're just. so. boring. Talking to most people feels like they're in slow motion, since my inner voice is so much faster.
Otherwise, the less social bit happened, not wanting to hang out with people, not wanting to leave the house, paranoia (in spades), "mild" (to put it lightly) hallucinations in the past, not being depressed where it'd make sense to be, and the random switch in self-esteem (yay college) are pretty close.