You should ask the court if it's possible to get a legal aid,they can try to get you in to a diversion program . If that isn't an option then find out what you can do to be eligible for expungement in the future. I goggled S.Carolina expungment these might fit your situation. I think number 4 can work for you if can get a conditional discharge. If it's not possible to get a legal aid it's best if you show up for court and try to work something out.
4) Section 44-53-450 (b). The defendant was convicted of first offense Simple Possession of Marijuana under the “conditional discharge” provisions of this specific law and has successfully complied with the terms of that sentence.
5) Section 22-5-910. The defendant was convicted of a first offense in a magistrate’s or municipal court for offenses other than:
A. an offense involving the operation of a motor vehicle,
If it's a minor charge it might be worth calling some lawyer maybe they can help you out for 750-1000 if it's just one court appearance. Most offer free consultations and you can call a few to see what there rates are.

