I think it would be good to find strategies to focus.

Start small. Pick one class and work on it. Break the assignment up into smaller parts. If your mind still freezes, take a short break by going outside for a short walk, watching the end of a show, a short youtube clip, or leafing through a magazine.

If you really were lazy, you wouldn't even be concerned about this. Or would think it's a big deal. Are you experiencing depressive episodes at all?