PLEASE HELP

Two days ago was my freshman orientation for highschool...I showed up 3 hours late because I was bawling my eyes out in my car because I have really bad social phobia and anxiety. I absolutely hate big crowds of people and I knew that's exactly what it was gonna be like. Please help me and give me advice because I don't know how I'm gonna handle my first day of high school ... I'm stressing out so bad that I'm breaking out