According to AAMC, for the most recent period available, there were there were 52, 777 applicants and 21,622 matriculants to US allopathic medical schools, which works out to a 41% acceptance rate.
https://www.aamc.org/download/321494/data/factstablea16.pdf
This number, however, is not complete in and of itself. It only includes those who actually made it to the application stage; in other words, they’ve got all the required courses completed, have excellent grades, an excellent MCAT score, LORs, etc etc-and the applicants are willing to shell out the money(it gets expensive applying to multiple medical schools) and take the time to properly complete the initial application(and any secondaries).
There’s both self-selection(students realize they don’t have the GPA/MCAT to get in) or external selection(can’t get the committee letter, can’t pass a required course, etc) so quite a few students start out thinking they’ll apply to medical school but ultimately do not. There’s no agreed definition of who is a “pre-med” so there aren’t accurate numbers on how many start and how many finish, but it is well established that it is extremely difficult to get the numbers required to get accepted.
Pre-med everywhere is tough, as there are dedicated students at every school who very much want to attend medical school. If you’re serious about it, find a school you like and can afford(medical school costs are astronomical, so you’ll want to save as much money as you can). How things go from there is up to you.