I know exactly how you’re feeling, the feeling of being small in a place that seems huge. Almost like your a pebble in a world full of boulders. This year I’ve had to apply for jobs. I applied to some pretty high up companies and got interviews for them. My stammer is pretty bad and has been for a few years now, but in my head I was determined to land a position at one of these companies. I told the interviewer before the interview started that I had a stammer and I needed a bit more time to answer questions. They were completely fine with it. That allowed me to relax a bit and not be as on edge. Maybe that can work for you?