I definitely agree about volunteering to try things out and get your foot in the door. If you find you don't love a field once you see it, even from a slight distance, you haven't invested anything in coursework. You'll be contributing outside your family, and that's good for your head.
Adult ed and community college are great ways to work your brain and feel relevant in new ways.
I wouldn't consider an on line licensing program especially for such a hands-on field like nursing. But doing stuff on the computer isn't going to nurture your spirit anyway.
I have a friend who runs a home care agency - there are tons of them around. They provide non-medical home care for people who would otherwise be in rehab centers or nursing facilities. Assignments can vary from companion work, driving to appointments and shopping, helping someone who is not too steady on their feet, helping with getting dressed and making lunch, etc. Not everyone is elderly or suffering from dementia - a lot just need extra help with their exercises beyond what the therapists are providing, etc. A lot of the people who do these jobs are people like you, some are nursing or CNA students (of all ages) - and it gives you some experience to put on your resume while sorting out your skills. My mother had 24 hour care for a while - 7-3, 3-11, 11-7, plus weekends. Lots of shifts are available. Contact your local nursing homes and rehab centers to see who they recommend to their patients who are transitioning to home. Once you collect a few good company names, go on some interviews.
Some people get jobs in hospitals too - admin or front desk services for example. Then they get acquainted with the realities and the staff, as well as the opportunities and some insight into the programs available. Red Cross centers (blood donation, disaster training) may have opportunities too.
Mammography and those types of jobs usually work reasonable shifts especially if they are not in hospitals. Same with medical assistants in offices. Nurses and respiratory therapists are vital and they also work crazy shifts and holidays. However, there are many opportunities and good pay. There are plenty of in-home services with RT, PT, OT, and similar fields.
I think you need to try a few things on and see how they fit before you commit to an education plan. Why not do that between now and the summer, then look at enrolling in a plan of study in September?