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You must think hard and act before it gets too late. Don't let you decision haunt you for the rest of your life. If I were you, I would definitely think of going back to school and get done with my MBA. Quitting your classes of master's level to work in a gas station is not very convincing. Plus, you are in the country where rules and regulations for immigrants are very unpredictable. You never know what kind of rules the government will conduct tomorrow. Once you are out of status, things can be tougher.
.It is always easier to pass comments and provide advices. You only know what you are going through and the reason behind this harsh decision you are making. Since you have asked for the suggestions, all I can say is go back to school and put some efforts for 3-4 semesters. It shouldn't be that hard. At least you can say "Hey, I tried".