Perhaps the most intimate question ever.
I tend to associate fear with youth as I continually struggled with various kinds of fear (from social anxiety to metaphysical Angst) in this period of my life. I was deadly serious, and so very subject to fear. As time goes by, you just don't take yourself seriously enough to fully believe in your own fears.
I can remember some of my young JW strategy, which boiled down to "fear God more than man"; a kind of imaginary homoeopathy (fight fear with fear). A good Bible equivalent of "fear only fear itself", with the added "God" element, was Jeremiah 1:17: "Do not break down before them, or I will break you before them." Or the equally paradoxical Proverbs 14:26: "In the fear of the LORD one has strong confidence." A lot of pressure anyhow.
Then I learnt to think more along the lines which Ross quoted:
I will permit my fear to pass
Over me and through me
And where it has gone
I will turn the inner eye
Nothing will be there
Only I will remain.
I didn't know those, but I often felt just like that: I am not my fear: let it come and go.
Also analysed it a bit: fear is overwhelming as a compound and when you separate pain and sorrow from it, it gets much more bearable.
Experienced a bit of "in love there is no fear" too.
And at that stage also learnt not to fear being fearless -- in contrast with the famous Calvinist statement: "If you fear not, fear; if you fear, fear not."
Btw, la petite mort is nothing to be afraid of...