What Am I Riddles

Question: Without me you will not live. Without me you will not love. Without me you have no courage,what am i?

Question: Light hides me and darkness kills me.

What am I?

Question: What's cheaper than gold, yet more valuable.Hard to find, but easy to loose

Question: I am often known as a symbol/mark, and can be used in a trend. I am created when two paths meet, but separate at the end. What am I?

Question: If you look at my face there won't be 13 any place.