Answer:
What three letters change a boy into a man?
I live above a star who never burns. I have 11 neighbors but they never turn. My initials are p q r and sometimes s.
The last man on Earth received a phone call, who was the caller?
Teenage girls are pros at creating me. Learn me in classes.
No matter how little or how much you use me, you change me every month.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.