“I’m just not creative” usually means “I haven’t made anything in a while.”

Creativity gets described like eye color, something you either have or do not, when it behaves much more like a muscle nobody has used since school. People who say they lack it are usually describing a gap in practice, not a fact about their wiring. The feeling of having no ideas is what having no recent output feels like from the inside. It goes away faster than most people expect.

Make something small today with no purpose attached. Ten minutes, no audience, nothing to post. Do that four days in a row and see whether the sentence still feels true on Friday.