Support for Anxiety

I thought I would like college more than I do. I worked really hard in high school to get into a good school, but now that I’m here, I only feel more pressure. I want to get good grades so that I can get a good job, so I worry a lot about that. And I knew everyone in my high school, but I feel like I don’t know anybody here. When I try to talk to people, I feel really nervous and get upset. I feel like I’m worrying all of the time, and I’m having trouble sleeping. I’m eating less and freaking out all the time and I just don’t feel like myself. How can I make my college experience more like what it’s supposed to be?