You have NO idea how hard it is to get into a MBA programme & to actually finish it . So the very fact that you did it , means you are already well qualified, even though you are underestimating yourself.
Once you start working , you will find that most of the corporate world is full of BS . Its all about WHO you know and not so much WHAT you know. Its more style over substance .
Its more about SOFT SKILLS ( 70 % ) like communication skills, personality, presentation skills, listening skills, being diplomatic, body language etc & less about HARD SKILLS ( 30 % )..like Math , Physics, Accounting etc.
If you are good at soft skills & good at attending some BS meetings etc ..you will do well in the corporate world. Its all BIG talk & pretending you know , what you are talking about..LOL :)
Just keep the clients happy , don't take things personally . Just be a YES man/woman & you will be fine. If your boss has some really stupid idea during the meeting, act as if its the greatest thing since sliced bread & just go ahead with it..LOL.
Collect your pay cheque and go home. If something better comes along quit & go there. Don't get stuck in one place. There is NO loyalty as such thesedays. The company won't think twice before laying of people & you shouldn't think twice about quitting and moving elsewhere too.