FYI fafsa does not have a time limit afaik, you can be eligible at any age, however...
Each time you withdraw from a class, it counts towards a percentage of permitted failures and withdraws. Go over that percentage and they take your money away. And of course you must maintain a certain GPA. I stress that withdraws count against you. Even though you didn't fail, it still counts. You also can only get a certain number of credits through fafsa. I think sometimes they'll make exceptions, say you were out of school for ten years. didn't finish college and want to change your major, they -might- let you get more credits. Maybe.
I know what it's like to not be the favorite child. My mother once told me she loved me, she just didn't like me. I got out of there as fast as humanly possible, had a job as early as possible to have my own income. Freedom is nice, but some things to take into account. Independence means you are obligated to pay bills or live in the street or at least have your stuff repossessed. That means you are chained to a job, and if you hate that job, you'd best find another one before you quit. Bonuses include getting to walk around the house naked, have sex anywhere in the house, and have the fridge all to yourself. All nice pluses, but those bills... It becomes very hard to improve your situation once you are on your own.
Anyway, maybe take some time with it. Hell, do something crazy like backpack through Europe and see some of the world before you decide. You can stay in hostels and such.
I hate giving any advice on this because life is different for everyone, and my advice may be entirely wrong for you.
My boyfriend was very indecisive about what he wanted and he dropped out of college like 4 credits shy of a liberal arts degree. (he was homeless at the time, tbf.) He STILL doesn't know what he wants out of life at 39 years old. It's quite possible to be indecisive forever if you are particularly cautious and uncommitted. I always knew what I wanted, even if that changed periodically. Unfortunately, I don't know how to fix the indecisiveness or advise you of a way around it.
A regular university will want you to have a well-rounded education, but a business college will stick to what you need to know. Certifications in heavy machinery and stuff as was suggested are good pay, but don't expect a pension or insurance. (though the ACA makes insurance more accessible, until the next election probably, when it will all go away.)