In-person courses. Going to class regularly helps you learn, keeps you on-track, and may be part of the course grade. And when you go to class, participate! It's okay to be nervous, but remember that other students probably have the same question—and no one is going to shame you if you have a question or answer a question incorrectly. Everyone at Chico State is here to learn. Another way to participate is to talk to other students during group work. You already have something in common, and talking to other students will help you make friends, enjoy going to class, and feel like you belong.
Online courses. If your course is synchronous, you will have class meetings at a specific time (just like in-person courses). Participating in synchronous online courses is a little different, but you should still attend class regularly and ask questions when you don't understand something. Keeping your camera on is a good way to keep a visual connection to other students and the instructor; talk with your instructor if your Internet connection is not fast enough to support video. There are on-campus places to attend online classes.
Asynchronous courses do not have specific times for class meetings. Learning in this type of course is more independent, but you still have support and the instructor to help guide you. Carefully read the course syllabus to see how you can participate. Many asynchronous online courses include discussion posts, and you can email your fellow students to arrange online study sessions.