We have beat this bush to death already.

At 18 you are old enough to be responsible for yourself. In my book you ought to be working. I'd be charging you rent. Now, I get that mental illness can be an impediment to working but you still should be required to start being self-sufficient and contribute. You are not a child anymore but now a young adult.

As I have told you before, there are a great many ways to contribute to the household that don't involve money.

But above all, you have got to stop this expectation that you are owed things in your life. It is unfair to the people around you and definitely not healthy. I dare say that there are people in your life that, while initially feeling helpful, have encouraged this view. You can't count on this continuing. Please, please, please realise that you need to stop expecting and start doing.

I am sure you have been asked before but the answer I cannot recall. What kind of help do you get? Counsellor? Therapist? Psychiatrist? This really needs to be at the top of the list of things to discuss.