Where to Go Now?

People say that you life really starts when you graduate college.  Well I feel that mine really hasn't.  Right before I graduated I had that feeling that, "maybe this isn't what I want to do for the rest of my life.  Now I still don't know what I want to do.  Currently I am back in school for another degree but I am not sure if that is what I want to do. I really confused on what to do. I ask my friends and family what to do but their advice hasn't really helped yet.  I feel like I am a prisoner of my own mind.  Any advice would be great.