You’re Not Alone in This
You can be objectively successful and still privately question whether you are as capable as other people believe you are. Promotions, credentials, positive feedback, and accomplishments may provide reassurance temporarily, but the doubt eventually returns.
You may attribute success to timing, luck, preparation, or simply working harder than everyone else. Meanwhile, mistakes can feel like evidence confirming something you already fear: perhaps you are not actually as competent as people think.
Imposter syndrome is particularly common among capable, conscientious people because greater responsibility often creates greater awareness of what you do not know. The result can be a strange disconnect between how others see you and how you experience yourself.