I'm going to narrow my feedback to a very specific thing you've said: "I will have to find a job instead of working for myself" - and at the risk of sounding sarcastic ask you if you'd only hire yourself if you had an MBA? My guess is no. Break down the connection that you see between an MBA (which are almost universally part of a corporate management track - not a requirement for entrepreneurship) and working for yourself.

If working for yourself is what you want to do - chase that down. If you feel that the "dream house" version of the business you wanted to build requires more experience / credentials than you have now - you don't need an MBA - find a proxy for your "dream house" business and pitch a tent on that same land. Find a way to start something right now that can grow into your dream business - even if it's a few degrees separated from the final goal. I talk to people every week who are facing similar challenges, and we are always able to identify a path forward with the resources at hand.

Shoot me a message and I'll elaborate.