Its not simple for other people. Most of them are just as scared. Take me for example, I've been on lots of interviews in the past 4 months and I have social anxiety and generalized anxiety disorder. I do it anyway. How? I get an email that says "Come in for an interview." and I drive there. I do it one step at a time. I get out of bed, I put one pant leg on at a time, I eat breakfast, I get in my car, I wait in their office, and I just do it. Usually they are very kind. I've even noticed some of the people interviewing me are nervous as well. It lasts a short while. I get in my car, go home and unwind. Then I forget about it, and onto the next one. Just keep trying. Say "I can" instead of "I can't".