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<p>They’re not going to want only naturally confident people. A huge chunk of the population isn’t naturally confident.</p>
<p>The thing to focus on here isn’t confidence, but overcoming difficulty - which it sounds like you have.</p>
<p>Regardless, though, one little thing you say in an interview isn’t going to be a big deal. The interviewer isn’t providing a transcript, and it’s usually only a small piece of the overall application.</p>