PLEASE go to your government disability offices and see if you can qualify. Even if you are high functioning, that extra bit of income gets you independence quicker!
Try to get over that feeling. I have a child that has ADHD. He went to college and it was about 90% paid for. At first I felt bad about it. Then I realized that he got a ton of help with his disability that he wouldn't have gotten if he hadn't made the claim. It was the difference between him graduating or not.
He's extremely gifted and talented at what he does. The extra boost was life changing for him.
Use every resource that you can. It may change your life in ways you never imagined. School counselors know ALL of the ins and outs of these situations. They can be your biggest helper. Don't be afraid to make an appointment to talk to college counselors. That's their job.
it's all down hill from there ha ha! just kidding.
I work a hard physical job and a man I work with is turning 65. He's just as strong as the 20, 25, 35 year olds. Age is just a number, retirement is many years away.
"Adult" is a state of maturity, not an age. Having taken control of your own life, responsibly, some time ago, I'd venture that the chronological age isn't the deciding factor in your case :)