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Mood
(slrpnk.net)
I think they call that depression
Speaking both from personal experience and what I've read from experts, Anxiety is also a very strong possibility. Often the two walk hand in hand.
You can make friends who are cool with it. Telling them may be important though.
No, it's not (necessarily) mood, it's a physiologicaly based capacity limit that can be masked only so much.
Memes related to anime. Animemes.