Ask yourself what you really want.
It doesn't sound like you're happy with your own degree, yet that's not the only thing your not happy about.
Change your degree to something more in lines with what you like at minimum. If you're not interested in anything, you better search elsewhere.
Goals are nothing, if you're not interested in the goals. You just won't keep to any goal, if you're not interested. So pushing something you're not interested in is futile.
Once you find what you're interested in, then you must set goals. As well as push yourself towards those goals.
Aptitude test are a start. Yet don't limit yourself to them. Being good at something, doesn't mean you're interested. Sometimes people get bored, if it's too easy. So try your second best aptitude. Or search in other areas.
Get out and look! Traveling is another way. Don't be afraid to audit courses either. That shouldn't effect your GPA and will help to see if you're interested.
