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They struggle to reach their goals because they haven't been taught for enough about the price to pay to get there.
They struggle to reach their goals because they don't have the courage to embrace anything. No one ever got where they wanted to be. This is the way they plan it. You need a general direction but you should never expect things to work out smoothly and predictably.
Your best life scenario always involves a lot of time wasted both exploration and big step forward despite feeling afraid and clueless about how your life might turn.