Please i need answers to my questions
I made a bitcoin transaction of about 0.021btc and payed a fee of 0.0005btc. This transaction have not been pending  for over 16hours now.

Here is my transaction id: https://blockchain.info/tx/163507c4e20a6fd44d93af8cd329ed36fd5febaa8bbaa024e4202106f46a8fed

My question are:
1: was the fee too small?
2: if it was will I ever get a confirmation to my transaction
3: How do I fasten my confirmation.
4  Can I cancel the transaction?

(Note): The bitcon transfer was done from an exchange to another exchanger.
Thanks