Trying to get my first job

Okay so I really really REALLY need a job, and I've been applying and today I scheduled an interview for around 3:30-4:30 pm which is like right now but I'm honestly terrified. like I have really bad social anxiety and its hard for me to talk to people let alone answer interview questions. I don't know how to get over this! I need a job pronto but I don't have any experience and my communication skills are horrible. I'm not even sure how or if I'll be able to answer the questions. I feel like I'm gonna have a heart attack. I can barely make small talk with strangers. what do I do? anyone have advice for me? I'm 18 BTW.