What Am I Riddles

Question: Silent yet deafening. Invisible, but you know it's there. It can either make you laugh or it can make you cry. What is it?

Question: I have memories, but none of my own,
whatever's on my inside is what is shown.
If I'm ever different it's because you changed me,
I feel like a decoration, here for you to arrange me.

What am I?

Question: Change a long pause into a short one by doubling a letter.What are the words?

Question: Though I live beneath a roof,
I never seem to dry.
If you will only hold me,
I swear I will not lie.

What am I?

Question: The more i am present, the less you can see me. Who am i?