Are you familiar with “basal metabolic rate”? It’s essentially the calories you need to consume just to survive and anything less is a calorific deficit.
So, just work that out and anything less is starving yourself. When I say that, I mean you literally lie in bed all day and don’t move at all, it does not take into account walking or even the energy needed to take a shower...
Although I do feel I need to ask this, how tall are you, your weight and sex if you don’t mind? Don’t want to give away information which would otherwise be taken wrong and it have negative consequences.