I just got into college and well, It gets better the longer you spend time there. I had so much anxiety that I had to get dropped off to the door of my college class because I genuinely couldn't gather the courage to leave the car. The only advice I can give it to do your best to focus in class, avoid talking to anyone if you don't feel comfortable talking and just try to do things that'll help you focus on tasks rather than the fact that you're at a college full of many people.