If you have a job you can and simply ought to hire an attorney. Messing this up at your age compounds the stupidity of your shoplifting. A criminal record hurts all future job applications, graduate school and college enrollment and mortgage applications for a house.
Hire a lawyer. Now.
If you were ordered to get an attorney, and fail to hire one, the general sessions judge will revoke your bond and you will go into custody, and either you will be given another date to get a lawyer or the public defender will be appointed. No judgement will be taken until you obtain representation. The longer you delay getting a lawyer, the less likely you are to get a favorable resolution.