How do I stop feeling like an impostor who hasn't earned it?

Notice that the feeling flatters itself: to feel a fraud, you must be quietly holding an impossible standard no real person meets. Lay the actual facts before God — the hours, the failures survived, the work truly done — and let them be true even while the feeling protests. You did not appear here by fraud. Ask to hold your gifts the way you would hold a loan: with gratitude, not as if you had stolen them.

The word is anavah — humility: not thinking little of yourself, but knowing your true size, neither inflating it nor erasing it.

From the sources “What is man that You are mindful of him… yet You crowned him with honor.” — Psalm 8