Please can someone tell me which is correct?

Which one of these is correct or how would you correctly say both variations?

You never know if your life is going to get cut short so make the most of it everyday.
You never know when might be your last day so make the most of it everyday.

Do both work?
The fact that I know he hates me annoys me.
The fact that he hates me annoys me.

Which is the correct word?
This is my way of showing affection to/toward him.

Which is the correct formulation?
You can open as many accounts as you have credit cards.
You can open as many accounts as credit cards you have.

Thank you