The UNC System is making an effort to increase enrollment of North Carolina students from under-represented and/or economically distressed counties, as set forth in a document styled “Higher Expectations”: The Strategic Plan for the University of North Carolina (2017-2022). At Page 9 in that document, it states as follows:
“2. Rural: By fall 2021, increase enrollment of students from Tier 1 and Tier 2 counties by 11% over fall 2016 levels (an average of 2% per year) to reduce the existing participation gap by at least half.”
(Counties are placed in “tiers” as follows: “The N.C. Department of Commerce annually ranks the state’s 100 counties based on economic well-being and assigns each a Tier designation. The 40 most distressed counties are designated as Tier 1, the next 40 as Tier 2 and the 20 least distressed as Tier 3. A county automatically qualifies as Tier 1 if it has a population less than 12,000 people or if it has a population less than 50,000 and a poverty rate of 19 percent or greater. A county automatically qualifies as Tier 2 if it has a population less than 50,000.”)
https://www.northcarolina.edu/sites/default/files/unc_strategic_plan.pdf
So, be aware that living in Sampson County could work in your favor regarding admission to UNC-CH, due to the implementation of this policy.
Also, the paucity of AP courses that you have completed won’t be held against you; if your school didn’t offer any, that’s not your fault. (The fact that you looked for one online would, I think, be a plus for you in the admissions review process as showing initiative.)
Further, if you are a URM (“under-represented minority”), recruited D-1 athlete, or first-generation college student, then you may have a better chance of admission.
You may be able to get an idea of where you place relative to recently enrolled students by looking at the UNC-CH Common Data Set, here: https://oira.unc.edu/files/2018/06/CDS_2017-2018_20180605.pdf . Part C9 of the CDS gives the median 50% for both SAT and ACT scores, as well as the percentage of the entering first-year class falling within certain ranges of SAT and ACT scores; Part C11 gives the percentage of entering first-year students falling within a range of unweighted GPA on a 4.0 scale, and Part C12 gives the average high school GPA of first-year applicants.
The CDS also tells you, under Part C7, that standardized test scores, application essay(s), letter(s) of recommendation, and the rigor of your high school record are “very important” academic factors considered for freshman admission, whereas GPA and class rank are “important” academic factors considered for freshman admission. Extracurricular activities, talent, and character/personal qualities are considered as “very important” non-academic factors.
I presume that you are planning to apply EA to Carolina? If so, then at this point (since your GPA will have been determined for admissions purposes) I would work on making sure that your essays and LORs are top-notch (as they are “very important” academic factors). I would also consider elaborating on your leadership abilities and examples of leadership in your ECs, which relate to the “very important” non-academic factors of character/personal qualities, as part of your overall application. (As I noted above, I think that you seeking out an AP class to take online shows initiative; and I would try to mention that – in an appropriate way, of course – in your application essays if the opportunity presents itself.)