Finding a purpose is not easy in general... but even harder when we put so much pressure on ourselves... try to relax a little and enjoy life for simple little pleasures and moments with friends and family...
...then start to
feel what sorts of activities make you happiest in general & write them down. Then think about what sort of careers those activities are suitable for. Though you should keep in mind that a purpose in life is not solely a career - there is SOOO much more to life than work.
Check out the cool website How to find your purpose in 20 minutes
www.stevepavlina.com Look it up - it's fun and may give you insight.
I know how you feel about being lost. And definitely move out. Cut the cord and do the grown-up thing. It will be hard, expensive, and CONFIDENCE building when you see you CAN do it. You CAN do anything.