Keep at it. In the end you will see, I promise, that the question is not whether you are. Nor is there a quantity to weigh.
Listen, there is joy in exploring and arriving.
Listen, there is work, there is pain in it, also.
If the challenge of "Am I creative?" or "Am I a real artist?" - or whatever your big concern is - motivates you well, then carry on.
But the worry could be joy instead, you know. It could be work instead, you know. It could be pain instead, you know. And in all those you would feel better than you would about the doubt.
Why? Because that's creating.
