panic attack during an interview

I can’t believe this is happening to me! I’ve applied for an internship at a big tech company, and prepared for two weeks! Researched everything about them, had my answers for most typical questions. And I blew it all up today! I knew I’d be nervous, so I spoke to my friend on the phone all the way to the conference room. I thought I’d be interviewed by the girl who was inviting me in, she looked only a little older than me, and I thought it wouldn’t be that bad? So silly of me! 😔 There were two men, super laid-back and friendly, why did I panic?? I knew I was losing it on my first question, my voice was shaky, and I wasn’t making any sense. I wished to sink through the floor and stop making a fool of myself! They offered me a glass of water, and it was so embarrassing. I know they saw I was losing my wits. I just gave up and didn’t make any efforts to answer further questions properly. I wanted to be out ASAP.

This, after I passed the first selection round - I know that few young men do. I won’t get another such opportunity in my life. I’ve never had panic attacks before! I’ve been extremely nervous during exam periods and when getting my license. But it didn’t stop me from achieving some results. What if it happens again?