The fearful unbelief is unbelief in yourself.

The doubt that does real damage is not doubt about ideas or other people; it is the quiet assumption that you are not someone things can work out for. That assumption does not announce itself. It shows up as not applying, not asking, not starting, each one explained by something practical. And because you never test it, it keeps its record clean.

Find one place where you have decided in advance that you would not be chosen or would not manage. Act as though the question were still open and take the first step anyway. Let the outcome tell you, instead of the assumption.