Beliefs can come from a variety of sources. They can be selfcomposed through observation, inherited from parents, adopted from others, or emerge from subliminal biases.
Most beliefs are adopted subconsciously. When you adopt a belief without consciously choosing it, it’s highly unlikely you’ll live it fully, because you won’t possess the reasons to believe that confidence requires. Without living it fully, you will neither obtain the missing confidence nor learn the limits of the belief, and you may well stagnate in the same questionable belief for the rest of your life.
Beliefs should not be adopted for frivolous reasons, but because they describe plausible paths to obtain what you desire. Intentionally search for the beliefs you need to obtain what you desire, and choose the options that are most believable.
Odds are that no matter what you want in life, you are not the first one to want it or try to get it. A great gift is provided to you by the examples of both those who have already found what you desire and those whose attempts have failed. You can have the same results of anyone whose actions you are willing to replicate under the same conditions. If you place yourself in the same environment and do what those who were successful have done, you will obtain what they have. And if you can’t find an example of one who has what you want, at least avoid repeating the approach of those who do not have what you want.