Since the "reality of life sucks" answer has been given, I will give the more optimistic based answer.
If you do find a dream job you want, the trick is to actually go for it. Im sure we all have thought how nice it would be to be an actor, or a musician, and while getting into those jobs is hard, its even harder if you dont do anything towards it.
Most musicians arent discovered, they make music, and perform it for whoever they can. Actors dont just get discovered, they audition for any role they can.
Ofcourse it sounds like you straight up have no idea what you want to do at all.
If you arent inhibited by personal/social issues, then just find jobs where you can, if nothing else, to support yourself. Eventually try another job, all while figuring out what you enjoy doing, and potentially what you are good at. You might be surprised what you're good at and would be willing to do for income. Maybe you're really handy with tools and would make a great repair person or mechanic and just never considered it.