It is true that if you were to experience life subjectively you would have no fears however you cannot experience life subjectively while you have fears. Fears are objective in nature, they imply that you hold something
outside of yourself as being worthy of being feared. And just believing in it won't help you with your biggest fears. I know some people who
believe to their very core that their God is always there to protect them but remain afraid during storms or fear death despite
believing that they will go to a better place.
True reality is not created (it just is, always has been and always will be) however the physical world (the illusionary reality) is created and it is not beliefs that creates it, it's intent through thought. And it is not the self that you identify yourself to be that creates but the being that created you in order to experience it's own creation. Physical reality is what you as the being created and only within the realms of subjective reality can you, the self you identify with, get in touch with the being that is really you.
If you continue your quest to understand subjective reality you will see that saying something like "holding a subjective belief" makes no sense. You cannot "hold on" to such a concept because as soon as you try to "grab it" (metaphorically speaking) the concept will vanish. As you have already experienced it seems. What's more, to fully understand it, the last thing you will need to do will be to lose the desire to understand it because the desire to "get it" will stop you getting it. A catch-22 perhaps
As I said in my previous post, the law of attraction as understood by most people, is objective in nature. Because of this it appears to have inconsistencies. These inconsistencies are a product of perceptions which in turn are a product of filters that you have created through your life experiences. Lose the filters and the inconsistencies disappear. Subjective reality doesn't so much explain the inconsistencies but rather it reveals the true essence of the law of attraction: it's not "attraction", it's "creation".
Steve's explanation is a good starting point but if I may, I would suggest that Steve does not live subjectively. Steve does live a good and very purposeful life and has much to offer many people who are wanting to better themselves and their lives. But he is not subjective in his approach to life. His post (among others) about travelling with his children shows this clearly. Understand that this is by no means a criticism of Steve. This is not a case of subjective reality is better than objective reality. In both cases it's what you make of it and Steve is a shining example of how one can live one's life. People would do well to follow his lead.
You need to know why you seek to "believe" in subjective reality. Because it's not a pre-requisite to a good life if that is what you are after.
Unfortunately there's no red pill/blue pill here to help you out
but I wish you well.