So nervous for first day of work

I've suffered from social anxiety for a few years now. I had a job for 1 year but I quit in 2014 to move. I've also had 2 jobs since, but quit both on my first day because I couldn't handle it. I just got hired as an overnight shift worker for 3 days a month (switch out new sets and whatnot) and I thought this would be the best fit! But my shift will start at 8pm, when the day staff are still in and I'm really nervous. I don't want to go but I know I need to start doing something. What can I do?