This is very true and an important point. You will want to think about other possible careers.
I agree that some find the premed classes too tough and can’t keep a medical-school-worthy GPA, and some find the multi-year marathon to be too long and too much of a drain on someone’s life. There is at least one additional reason why some aspiring premed students pick a different path: Some students when they get to university just find a different path that they like better. As one example, one daughter got into lab courses, and decided that she would rather do medical research in a lab rather than deal with actual human patients.
There are lots of other career options for someone who starts university thinking “premed”.
This also makes a lot of sense to me. Premed classes are tough. You don’t want to arrive on-campus as the student who just barely got accepted and who is competing with a long list of students who came in better prepared. Also, schools for which you are a stronger applicant might also in some cases be more likely to provide merit based aid.
This uptrend might help you to do well in the tough university premed classes. Keep up the good work. The effort that you put in now is very much worthwhile. The better you do now the better prepared you will be. Also, when you arrive on campus at university, plan to be making a huge effort starting day 1 to keep ahead in your work and to do as well as you possibly can in every course. Expect some tests and exams to be tougher than anything that you have ever seen up to now.
Both daughters had majors that overlapped a lot with premed classes. Both have mentioned tough classes with tough exams. One mentioned that the first midterm exam in her first premed class had a class average in the mid 40’s. I took this as the professor doing a favor to the many premed students in the class – they were making the point early that most students were going to either up their effort considerably or find some other career path that did not include medical school.
Your uptrend in high school is likely to make you better prepared when you get into these tough classes.
Unfortunately I am not familiar with the various public universities in Florida (we live way to the north of you). However, I do think that you should take a close look at your in-state options and apply to some for which admissions is very highly likely. If you can get merit aid or other financial aid that can be important. As others have said there are hundreds of universities that are very good for premed students, and that also offer many other options for students who decide against pursuing a career in medicine or who pursue a medical-related career that does not include an MD or DO (there are lots of other options).