I think if you were lazy you would be content with how you are living and not worried about it enough to bring your concerns here.
It might be the antidepressants you are on aren't the right ones for you. I understand there is often some trial and error finding the right one and right dose for each patient.
Is your GP aware of how you are currently feeling and functioning? If not, I think it would be a good idea to have a frank conversation with them so they might adjust your medication or consider other possible physiological reasons for your current condition. Possibly anaemia as a PP suggested. My understanding is that can be caused by a lack of iron in your diet and I'm guessing you might not be looking after yourself in terms of eating healthily given how you are feeling right now.
Personally, I wouldn't raise the possibility that you might be lazy because in my experience some GPs would run with that as the easy option just to get you out of the door. It would also stay on your record and possibly colour future consultations. And before anyone jumps in to say GPs would never do that, there is a reason for introducing Jess's Rule and it was long overdue.
In the meantime, all the posters that have said you should get off your phone are right. I know when you feel the way you do, the phone is an easy distraction but for some reason (I don't know what exactly) constant scrolling, even if it isn't doom scrolling, messes with your head but books, which would be similarly distracting, don't. It can be hard to concentrate on books when you are in this frame of mind but I think you might feel a difference as quickly as within a day or two.
I hope you get some relief from this soon and will be able to get back on track with your course. 💐