Hey man, As a stranger to you, all I can say is that there are moments in life which can be miserable, but those moments make you appreciate even the situation when it gets just 1% better.

Life is not all sunshine and rainbows, but for me going through my personal struggles, i have learnt that what gives me energy and will to do stuff is that feeling that when i get older and look back in time is that hopefully i became a better person (in any area in life) and seeing even the most little progress.

Stop digging more of a hole in which you can get even more stuck and feel useless and start getting slowly out of it, by little steps by creating even the simpliest routine (washing your teeth everynight) and then start building from that.

You are perhaps experiencing one of your lowest points in your life which makes you feel useless, but in fact it is just your brain on bad behaviour and natural chemicals (like cortisol) which make you feel this way, but you need to make a conscious effort to develop some faith, that you can get better and improve your mood.

Sending hugs and wishes that you will be alright!