There's a lot here that doesn't exactly make sense. The OP pointed out herself that she jumped in with-out much business background. I think you owe it to yourself to get help and figure out the realities of what you have before you walk away from it.
I think OP needs to go back and relook at her lease. That price can't be right for 250sf. That's premium rent, you've got to be in a unbelievably great location to be paying that much.
From all the bits and scraps of info. you've posted I think you seriously need to sit down with a business professional and get all your business data figured out. It would be worth paying a cpa to help you figure out your books.
Definitely worth a trip to your local SBA and get someone to help you understand things.
You need to know exactly to the penny what you're spending and what you've taken in for everyday, every week, each month! I don't get the feeling that you know those details. Do you know your costs verses your profits per item in your case? Are people walking in your door buying?
What if a few changes made the difference between paying you rent or not? I'd make them if I was you. That's a lot easier then re-inventing yourself financially.