The company that invited you to the interview wants a qualified employee and has chosen you because you could be that person. This should not make you arrogant, because there are usually several applicants. Nevertheless: Don’t make yourself unnecessarily small and be proud of what you have achieved so far.
Play the application situation several times alone in front of the mirror, with friends or family. It also helps to think about how to react to unpleasant questions. But remember, don’t go crazy and don’t get upset. You will see that such a conversation is usually not so bad and the more experiences you gain, the less nervous you are before the unknown.
We don’t want to send you from interview to interview now, but you should have the following in mind: The exercise also makes you a master when it comes to introducing, and there is usually little you can lose. But you can gain a lot: the chance for a better job or a free interview training – combined with the check how much you are currently “worth” as a person on the job market.