Answer:
What building has the most stories?
Teenage girls are pros at creating me. Learn me in classes.
I am good at concealing what's real and hide what's true. Sometimes I bring out the courage in you!
I have a name that's not mine and no one cares about me in their prime. People cry at my sight and lie by me all day and night.
I go up when the rain comes down
No matter how little or how much you use me, you change me every month.