I know how you feel. I've gone down many a road, and wasted so much time, as they lead to dead ends, something i feel passionate about one day, and do many courses, suddenly dosen't feel right anymore.
Yes, i wish someone would tell me what i'm supposed to do in life, cos i sure the heck don't know.
It would have been great to have been born with a definate talent, and you knew the goal you were working towards. Life is passing me by and i still haven't cracked it.