Why am I like this?

I don't understand myself. I refuse to do anything and just want to lie in my bed doomscrolling, even doing things like taking a shower is difficult, that's why I can go days and even weeks without taking a shower, which is disgusting. I'm aware of this but I can't tell myself that I'm going to get up and take a shower and it takes a lot of mental strength to do it. I don't feel sad, that is, I don't feel anything, neither sadness nor happiness, I'm numb.

My family can't stand me anymore because I refuse to help with everything and when I do accept it, it takes me ages to do it. I can't stand being like this anymore either, but I don't have the will to change. Why am I like this? The only things I do in life are shop compulsively, sleep, eat (a lot) and doomscroll all day watching self help videos hoping that one day I will change.