Fear in my experience has inhibited me from achieving many things from social endeavours, new experiences or intimate relations and generally pursuing more of a life without getting overly concerned about the consequences.
However, some may argue that fear can be a positive emotion, as it's involves us to critique with rational thinking.
For example consequences of jumping off a damn cliff or something.
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I think you're "conflating" the word "fear" with the definition of "anxiety."
"Anxiety" is not "fear."
"Anxiety" is the short term for what psychologists more accurately refer to as "apprehensive expectation."
"Anxiety" = "Apprehension" about your "Expectation."
"Fear" = an emotional response to certain or almost certain (i. e., "imminent or highly probable") "DANGER."
"DANGER" is the magic word. Danger usually means anything related to your "immediate" survival (i. e., if you don't feel "FEAR" and you go ahead and "ACT," then you're most likely going to "DIE"). For that reason, you can see how humans that had a very properly developed sense of "FEAR" "survived" (and therefore, reproduced) compared to those that didn't (well, we know what happened to them).
"Anxiety" is totally different. With anxiety, a person has a certain "expectation" about the future or distant consequences of their choices or actions. That "expectation" is usually "negative" or "over-conservative." As a result, the person is very "apprehensive" every time they even "think" about their "expectation."
For example, a husband comes home from work. He "expects" his wife to not be in the mood, or tired, or some other excuse, so when she comes next to him and wants to be affectionate, he acts cold, detached, unemotional, disconnected, etc. He feels "apprehensive" about the idea of either him trying to initiate sexual activity, or her trying to be affectionate (because it will then make him feel turned on, and his "expectation" is that if he tries to initiate any kind of sexual activity, he will just be "shut down" and end up feeling negative, rejected and frustrated. So, he is "apprehensive" (meaning, he looks for ways to "avoid" what he imagines to negative consequences).
"Avoidance" is the key characteristic of "anxiety."
Avoidant "behavior" is not the main problem, it's avoidant "thinking" that's the problem. Avoidant "thinking" happens when the initial "apprehension" towards a perceived expectation occurs. At first, the brain simply wants to avoid what it perceives as a likely "negative" or "uncomfortable" (emotionally) situation. But very quickly and almost immediately thereafter, the brain does something remarkable - it "creates" (rationalizations) and (supporting justifications) to support and justify "why" a person engages in avoidant "behavior."0