I want to echo Sophie_M in welcoming you to the forums and in encouraging you to reach out to Beyond Blue's Coronavirus Mental Wellbeing Support Service. Most of all, what I have to say is just that yes, what you are feeling is completely normal.
Everything you're describing: trouble with classes, isolation, difficulty moving away from home are all totally normal parts of your first year of uni, and that's *without* a global pandemic! I think in hyping up uni your family probably remember their own time there fondly, but may have forgotten that especially at first, it can be a hard, stressful experience.
I totally relate to that sense of loneliness despite having plenty of loved ones, and that lack of motivation. It's really, really hard to do my academic work from home.
Now for the practical stuff: most unis have great resources for students who are struggling with classes for any reason, and I would imagine you're far from the only person having a hard time finding that same drive now that everything is online and your world has been turned upside-down. Exercise, limiting news intake, and planning nice and absorbing activities for yourself are all great. But above all, be kind to yourself.
No one has had a uni experience quite like this in a hundred years; nothing is "normal." So the odds are however you feel is as close to "normal" as anyone.