A belief does not exist in a vacuum. They interact. If you believe you are the most incredibly talented painter in the world but society at large won’t understand your vision then you will only famous in small circles. Change that belief and many things can change, your internal choices, inspiration, and direction with your work, or the subtle choices you might make in marketing, or/also simply the actual response to your work.
You can believe yourself the most gifted in a field but believe that a [insert characteristic here] person isn’t afforded the same opportunities as the rest and never advance.
There are plenty of belief interactions that can occur, some can completely nullify others, which can be either beneficial or detrimental, depending. This is why it’s a good thing to cultivate some really positive blanket beliefs, and give yourself sleep suggestions in the vein of, “I suggest I only react to constructive suggestions”.
You might fear harm but also believe that you are well protected, and so perhaps the only manifestation will be alternative ways… dreams or video games, or who knows what.
Fearing something doesn’t “mean it will come true”, earthly reality does not work that fast. But if you persistently find yourself in a state of fear, that is what you are headed toward, yes. The fear itself exists because of one or more beliefs. Emotion is the product of your beliefs. So to ask how to fear something but not have it occur is indeed really not a valid question, you want to identify and change the belief that is generating the fear.