First of all, you are doing very well. Also, your safeties are very good universities, and two of them are very good in-state public schools.
Secondly, since I see “premed” in your post, you should budget for a full 8 years of university. Medical school could very easily cost $125,000 per year by the time that you get there. You should double check whether your parents are really okay with paying perhaps $900,000 by the time that they call you “doctor”. If they cannot do this easily without debt and without any hardship for your family, then it probably makes more sense to save money for your bachelor’s degree rather than to save money through your choice of school for an MD or for some other type of graduate program. Given that two of your safeties are very good in-state public schools, saving money for your bachelor’s is indeed possible (and may be relatively easy to do).
The “big name” universities do get a higher percentage of their graduates into medical school. However, a LOT of this, and maybe even all of this, comes from the level of student who starts off as incoming freshmen at these big name universities. Any one very strong student is not necessarily any better off starting off as an incoming freshman in the middle third of students arriving at Cornell or Dartmouth College relative to being in the top third of incoming students at Stony Brook. Also, even with your superb results up to this point, you might hope to be in the top 1/3 of students at some of these schools, but there will be plenty of other students in your premed class who are just as strong. I have known some of them (both daughters had majors that overlapped a great deal with premed classes). Premed classes will be very demanding, and you might be surprised at the consistent high quality of the other premed students at a wide range of universities (which is encouraging news to anyone who might need a doctor in the future).
You can major in almost anything and complete the premed requirements and apply to medical school. The potential majors that you have listed are good ones, overlap somewhat with what my daughter’s majored in, and could also lead to other potential careers. Many or most of these other potential careers involve some sort of graduate school. PhD’s are usually fully funded, but master’s degrees are usually not. Most (not quite all) of the people I have known who got a PhD first got a master’s degree on the way. If you save money for medical school and instead end up studying let’s say cellular biology, the money that you saved can still be very useful to fund a master’s degree.
You have some very large schools on your list (eg, UCLA, Michigan) and some very small schools (Dartmouth, Swarthmore). You have schools in cold locations with real winters (Dartmouth, Cornell) and schools in very warm locations with a lack of winter (Vandy, UCLA, USC). You have schools in big cities and schools in small towns or rural areas. Think about what you want in a college or university. Think about what location you want to be living in for four years. Also think about the long airplane flights and waiting in airports for a flight home. Would this get old after a while?
I do not see the allure of long flights to be full pay at the various universities of
California. They are very good schools, but so are the public schools in your state as well as other public universities in states that are nearer you and where merit aid is very likely (which it is not for an out of state student in California).
In terms of extracurricular activities, you have a rather long list. I think that you should focus on doing whatever is right for you, and doing it well. It is better to have a short or moderate length list of things that you do very well, rather than a long list of things that you do moderately well. You might want to read the “applying sideways” blog on the MIT admissions web site. While MIT is not on your list (possibly for good reasons) the same approach of “do what is right for you and do it very well” has worked for us in terms of admissions to a number of very good universities, most of which were not MIT.
Mostly I think that you are doing very well, and you are a competitive applicant at any university in the US. Keep up the good work, make sure that your safeties really are safeties, and best wishes.