I'm not clear why not being in your 60's has any relevance here? Many people younger than their 60's are on SSDI or other forms of disability income, if that is the question.
You should NOT suddenly stop the steriod treatment. If you do intend (or need) to stop, you have to taper off, or you'll suffer some serious side effects. Talk with your doctor about how to do that.
As for getting to the treatment center -- do you have a senior citizen transportation center in your town? Even if you're not of "senior citizen" age, they'll take you to medical appointments if you are disabled and need a ride. You might call them and see how to get on their schedule . The one here will ONLY take people to medical appointments and a once-a-month grocery store shopping thing (no where else, not even to the senior center!), but that might at least help you get your treatments.
...I am not a doctor, nor health professional, and don't pretend to be one, here.....