Answer:
I am very afraid of doing scary activities.
What goes up and down, but does not move?
I have fangs and enjoy piecing holes with a single bite.
You cannot keep me until you have given me. What am I?
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
They come to witness the night without being called, a sailor's guide and a poet's tears. They are lost to the sight each day without the hand of a thief.