Condensed version:  coasted through Management concentration in undergrad at a good private school, did well within the discipline but was indifferent to everything else, graduated, have been doing the full-time stable Management job for five years, and now I'm stuck.  My interests are I/O psychology, change management, and project management.  I need expertise and practice in each area.  My goal is to be an I/O consultant, but I essentially want to acquire as many valuable Management skills as I can.  I have determined that I should pursue graduate study. 
 
I have no research experience and an unremarkable academic record.  I won't get into a PhD program without doing awesome work in a MA.  Even then, I'm not sure if I need a PhD if I'm focused on an industry career.  I applied to Fairfield MA in Applied Psychology and The New School MS in Organizational Change Management.  Both have rolling admissions, and I'm confident I'll be accepted to both programs. 
 
However, I feel like I'm "missing" something.  Actually, it's everything.  I question my ability to do graduate work, how I'll fit in a program, what expectations I should have, and what I'm actually preparing for.  I read many posts on this forum and talk to friends in grad school, and I just feel like an ignorant outsider.  Do I even belong in grad school?  Am I fooling myself by expecting significant career advancement? 
 
Basically, what the hell am I doing here?