As others have said or implied, medical school is expensive. Even doctors can have some difficulty paying off medical school debt. You need to save money for medical school.
Most students who go off to university intending to be premed end up doing something else. There are a lot of other options, many of which are related. However, as a high school senior, you should keep the medical school option open from a financial perspective, which suggests that you need to budget with the expectation that you will go to medical school. If you decide at some point that you would rather get a master’s degree and do biotech research (and perhaps work alongside one of my daughters), the money that you saved for medical school might pay for a master’s degree instead.
There are a lot of universities that are very, very good for premed students. UNC is one of them. U.Alabama is another. UGA is another. Top medical schools will have students who got their bachelor’s degrees at a very, very wide range of schools.
Premed classes will be full of very strong students at any one of a very wide range of universities (including every school on your list). Some of those premed classes will be very tough.
Let’s suppose hypothetically that you get accepted to WUSTL or Emory. Are you better off, in terms of your chances of getting into good medical schools, to attend WUSTL or Emory entering in the middle third of the incoming class, or to attend UNC entering in the top 1/3 of the incoming class? Frankly, in terms of your ability to get accepted to a very good medical school it probably just does not matter. In terms of your ability to afford medical school, you are better of to have chosen the less expensive option for your bachelor’s degree. If you do end up being accepted to either Emory or WUSTL or both, and if they would be full pay, then you probably would be better off at one the more affordable schools where you have already been accepted (unless your parents are multi-millionaires and do not mind spending most of one of those millions for your education).
Let’s suppose that you attend UNC and live on campus. It will not be like high school at all. You will wake up in a dorm full of other students. The vast majority of the students in your university will be people who you do not know. Students who are academically like the bottom 1/2 and probably 2/3 of your high school class just will not be there. Instead, you will be surrounded by very strong students, and a lot of them. Classes will be demanding. It will be like living and studying in a different world. Of course the same is true for any of the other universities that you have applied to.
You have already been accepted to multiple very good universities. Congratulations! As a potential premed student, the hard work starts in September.