Has your case not been resolved? To get it expunged the charge must have been dismissed or you must have been found not guilty after a trial. In some counties they will dismiss charges if you perform community service. It really varies from county to county. If you have not done so, you need to hire an attorney in the county where your charge is pending. The Find a Lawyer function on this site is very helpful.
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It depends on how old you were when you were convicted and local practices. The NC expunction statutes allow relief under limited circumstances. If you cannot receive an expunction, in some counties, you may be able to file a motion for appropriate relief to re-open the case. You should consult a few local attorneys and ask what your options are. Good luck!