I see the world through the lens of self protection - which implies constant fear.
I am the necessary basis for fear. Fear is my reason for existing. The movement of fear is me.
The me = identification with a center for survival purposes (which is fear).
However circumstances change regularly - so there is a difference in intensity, I do not always feel the same way as when bungee jumping or watching a horror movie. Sometimes I am having a nap, or eating an ice cream.
We associate high intensity self with fear : panic, terror, alarm. But there is also medium intensity experience of self : anxiety, worry, timidity. Low level, resting level.
But maybe the hardest to recognise as fear are what are seen as positive experiences : attraction to a mate, effort and pleasure of accumulation, relief when feeling safe & secure, happiness when with the tribe/family etc…
We are used to using the word fear to point at certain emotional states - but there is also the understanding of what fear is - how it works, what it means, not just what the word symbolises for communication purposes.