Also, what college students do most UCSF pick from? Such as students from UCLA, Harvard, or Stanford.
Internal medicine is a medical specialty, the training for which is completed in a residency after medical school and an internship. It doesn’t work the same way as applying to a college. Residency training is conducted in teaching hospitals, and selection of candidates for residencies follows a matching process. http://www.nrmp.org.
Are you an international? Medical school in the US is where you go AFTER college or university. You can’t study medicine in college or university as you can elsewhere in the world. It is also very difficult to apply to US medical schools if you are an international -and very expensive. Less than 1% of US-based medical students are not citizens.
So, get your medical degree in your home country. Then apply for a residency in the US in a specialty of interest - which show most foreign educated doctors end up in the US.