Repeating what others have said, but as the person in question. I'm incredibly depressed in the sense that I struggle to find motivation to achieve fairly basic tasks such as laundry, feeding myself, etc + extremely numbed emotions, but I am high functioning through a combination of anxiety and force of will (I'm graduating with a decent GPA from a state school with a job lined up).
It can be highly invisible; in fact, I reckon that it is usually invisible and most only see the extreme cases such as your roommate.
Are you diagnosed, need to take medicine, is it chronic, do you need to visit your doctor frequently and have a lot of problems, even social issues...?
If not, then you don't have depression, you are just sad/bored like most of the people in this world and is misusing a word and kind of downplaying on depression.
Yes, I am diagnosed by two different psychiatrists and have been taking medication and been in therapy for over 7 years. It impacts my life daily and has caused a great amount of harm in my life. This includes self-destructive behavior and (long ago) suicidal ideation.
Don't make assumptions about people you don't know.
It can be highly invisible; in fact, I reckon that it is usually invisible and most only see the extreme cases such as your roommate.