Psycho and looking for a cure

Warning: Dumb, self-searching, quarter-life-crisis post. Read at your own risk.

I don't understand myself sometimes. With some people I hardly say a word, and sometimes with complete strangers I just manage to talk quite "normally" (I mean like not psychotically quiet), even bordering on friendly! With the people at my internship (die lor if they come see this) and like half the people in GE I can hardly speak, and last night this bunch of people were looking for the tent for the Karnaval Humanitaire (which is a yearly event in INSA, and which I have never been to) and I not only offered to show them where it was, I even spoke a bit to one of them on the way (of course, she wasn't absolutely quiet, which was probably why) but what really really surprised me was how in the end I wished her bonne soirée (have a nice evening) of my own accord. I hardly ever say that, not even to my friends. What's gotten into me?

Now can someone help me figure myself out? -_-