That is a huge problem for a lot of us more introverted types, especially if you're a transfer student from another school. I remember taking a bunch of classes where I didn't know anyone and had no one to discuss problems and solutions with. Organic chemistry, diff eq, among others, but pretty much all classes were like that. Having social anxiety issues made it very hard to work my way into the community. Meanwhile the other students had all been stuck together in the same program for years, the same dorms, the same fraternities, etc.
I'd come in and the entire rest of the class would be sitting around sharing their homework answers, copying each other on the ones they couldn't figure out, getting help from each other... Never had any access to it and I know I worked harder for lower grades (in some cases) just because I wasn't part of the in-group.