You're going to have a few rough years ahead while you get used to the normal bills and crushing debt of regular life. Just don't give up and don't make excuses. At your age, 95% of all of your time must be spent working or crushing it in college. I didn't do anything fun, recreational, or anyway not soul-sucking for YEARS when I was young because I didn't think it was right for me to have fun if I needed student loans. I'm very thankful for this attitude because it kept me alive during the years most-school when I had to keep working several jobs on top of each other. Even now I have a salary and make significantly more than my family ever has, but I still work another second part-time job and do freelance work to keep paying down my debt. I also still don't believe I should ever allocate money towards anything fun or recreational, and so I don't except for once a year splurges like an exercise bike that I got for my birthday. I had to live in a corner of someone's room on the floor during school at one point, and now I live in a downtown Denver apartment by the civic center. My point of this is to say there will never be a glamorous or easy way out of this situation - it's YOUR job to crush your obstacles and survive. Even though your mom sounds terrible, it sounds like she still took care of you way more than she should have. No mom should allow their 21 year old to get to that age without significant life savings already unless they are extremely poor. Now you have to make up for not working enough jobs in high school and not having enough jobs in college. You should REALLY be working multiple jobs right now, even if you're a full-time student.

Also, be prepared to be denied for social services because you don't work enough hours by many state standards to qualify when enrolled in college. It sounds like you're really going to need a sublease or a very understanding situation, and I don't blame you for being scared of the ads posted by single men but you really don't have the option to be picky. It sucks living in someone's corner on the floor with none of your belongings anymore after you've sold everything you own and only have a bag of clothes left, but situations like that will make you work harder until you're able to stand on your own.