In my past, I was in the same point. Wasn't sure what to do and what I wanted. It took for a while to find my path but I'm happy that I took that time and found my path.
My tip would be to study something general or something 'introductive' to which you don't need to bond yourself 100% if you don't finally find it as your way. Or then (I'd see that even better) have some practical experience from different fields. Especially if there's something that you're interested in but aren't sure, would it be able to have a contact to work life so you could see what that field really includes? Anyways, IMO the most important thing is that you do something since sitting at home can finally turn very passivating thing.
Also I think that study what do you feel important to you. With a lot of determination you can get far. And the fields that you mentioned don't even sound the most hardest ones.
. I'm sure that you'll find your way, was it law or something else. With some people it just takes some time.