I’m 18 y.o. and stuck. Give me your harshest criticism.

I'm 18 y.o., all I do is rotting in my bedroom all day. I dreamt of going to Cambridge, but gave up due to life struggles. My body is a nightmare, I don't have a will to live and hate myself to the core.

I want to go to college, move out, get myself in shape and earn money.

I need to retake exams, time is until summer.

Give me your harshest criticism, advices, etc., so I would finally start to do something.