In addition to what the above poster states, you shouldn’t focus entirely on your GPA to the exclusion of other things. If you look at the UNC-CH Common Data Set, under Part C7 it states 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.
So while your grades are an “important” admissions factor for UNC-CH, your standardized test scores, essays, LORs, and the rigor of your high school coursework are even more important as admissions factors, according to UNC-CH. Consider taking both the SAT and the ACT; people usually do better in one than the other. Also, taking some test preparation courses may help you with your performance on these standardized tests.
If you want to see how you compare with recently enrolled students at UNC-CH, Part C9 of the Common Data Set for UNC-CH 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.
By way of comparison, our OOS high school usually has 8-10 students who apply, and 1-2 students who are admitted, each year to UNC-CH; and, with the exception of legacy students, our admitted students have SAT scores of 1490+, ACT scores of 33+, and weighted GPAs of 4.4+. These successful applicants also were involved in extracurricular activities that showed commitment over time (no “drive-by” ECs), and demonstrated leadership in the school as well as their ECs. Other kids in our city who I know were admitted to UNC-CH recently also had similar academic statistics and non-academic characteristics; and all of these kids were “unhooked” in admissions parlance (i.e., not a recruited D-1 athlete, or a URM, first-generation college student, etc.).
I don’t know whether your high school has Naviance or any similar program that gives information about how students at your high school have done in applying to colleges and universities; if so, you might peruse that data. I would also try to meet with a guidance counselor at your school either next semester or early in the Fall semester of your senior year to discuss application strategies for UNC-CH; if any former students from your school have been admitted to UNC-CH recently, the guidance counselor may be able to give some insight into how and why such student(s) were successful.
Also, you should ask yourself why you are focussed on going to a “selective” college or university. It seems like you have enough stressors in your life right now, and attending a “selective” college or university – which can have a “pressure-cooker” academic environment – may only compound those for you. Don’t get trapped into going to a school that may not be the best for you, simply because it may be desirable to other people (such as parents or a circle of acquaintances).
In terms of other schools to consider, what are you interested in studying? What part of the country do you live in, and how far are you willing to travel to go away to school?
Finally, try to have some fun along the way, if you can; high school is not simply about getting into college, and making yourself miserable in that process won’t do you any good, really.