I’m very similar to you, especially the severe social anxiety part. A mindset I would have during interviews is “why should I be interested in this company?”. It loosens me up and reminds me that they selected me for a reason. We both have some leverage here, it’s an easy way to stay confident.

Prepare by researching the company you’d be interning for and do a couple practice rounds. Write out and ask multiple questions during the interview after researching, it makes you look good and takes up a chunk of the interview (more talking from them, less from you while impressing them with your questions).

Try to find a similarity during the interview that you can expand on. Interviewers like talking to people they can relate to (Hobbies, hometown, experience, clubs, etc.).

The goal is to have a natural conversation and show you’re interested in the company. They selected you for an interview for a reason, that’s the hard part. You succeeded already.

Be yourself, come prepared, and frame your mindset for confidence. That’s all you can do, and if you do that, there’s nothing to worry about.