If you don't know what you want to do, you could just do something broad like an arts degree or a science degree, and then do postgrad study to specialize a bit more. That way you have got more time to figure out exactly what you wanna do, and you will experience stuff at uni that might really help you make your decision.
Also while you are at uni you will hear about all the other courses/career paths and this will help your decision.
And no matter what career you go in to, employers like employees that have broad skills.