Man it's crazy how hard it is to get disability for mental illness. Like every normie will admit they don't want to work with a crazy person, I bet the people at the disability office probably don't want to work with a crazy person either. But then they make it prohibitively difficult for them to afford a life with basic dignity, especially in America.
Idk much about applying for disability, and I can only speak for the USA process, but if you have a shitty job in retail or food service where you make less than about $1.3k per month, you aren't doing substantial gainful activity, so I think you'll be at an advantage in that case, espec if your work history is spotty and you have no higher education or professional training. I think the disability people like to see that you've made an attempt and that you have been clearly and consistently beyond help. Getting a SSI/SSDI lawyer will also help, there are some who will only ask for your first few months' benefits as payment once your case is won.