Going to interviews is nerve-wracking, especially for introverts. The top tip I give my clients is to go to the interview with questions for the interviewer. This tactic does two things:
First, it helps you be less stressed over the interview and it gives you the opportunity to have a bit of control during the interview.
Second, it lets the interviewer know you are serious about working there. Interviewers rarely get asked questions, so it surprises them and makes for a more memorable interview. Just make sure you do your research and have good quality questions to ask.