Career contentment rarely comes from figuring out the right career for you. It generally comes only after you've gotten into some career that's a reasonable fit, done a thorough job search so you can land a decent job, and then gotten really competent at your job.
So, pick something, anything--perhaps a career in which you have connections that can help you get a good first job or at least be a mentor to you. Then throw yourself into your work as though you were totally passionate about it. I've found that to be the surest route to career contentment.
If you're older than 25 and still trying to figure out what career to pursue, be sure you're not just procrastinating because you really don't want a career.