So I had the same problem while JEE prep, thinking people without coaching are also scoring the same, without study material, I won't reach there..
But during placements, it has helped me a lot to think that, I prepared for the company fair and square. I gave my best and have been rejected multiple times.
Now that I've been finally selected, I belong here. They know my positives and negatives and they think I'll have a meaningful impact still.
So there's no need to feel like an imposter, because 'I belong here', fair and square