I almost drowned once, they say what doesn't kill you makes you stronger, it is not so, as I ran out of oxygen, I quickly accepted death, without much struggle, it almost felt rude when I was rescued. I felt deflated afterwards for accepting death so easily.
In comparison, your fearing death is a *good* thing, it means your "will to live" is as yet quiet strong, you will probably struggle to stay alive until your last breath.
But then again, fear is probably a harmful thing to feel when not in acute danger. I am sure there are methods to control it.