The following response is intended for general information purposes only and is not to be construed as legal advice.
Unfortunately, you do not qualify for an expungement in North Carolina under the current expunction laws that exist. I have provided a link to those laws here. Additionally I have provided a link to the newest expungement law here. As you can see from reading these expungement laws, you are not eligible for an expungement because your conviction is for a felony that is excluded from the newest expungement law. Only non-violent felonies that are Class H and I felonies are included under the law. Your conviction of "armed robbery" would be characterized as a violent felony.
"§ 15A-145.4. Expunction of records for first offenders who are under 18 years of age at the time of the commission of a nonviolent felony.
(a) For purposes of this section, the term "nonviolent felony" means any felony except the following:
(1) A Class A through G felony.