Hmm. My DD took 24 credits as a senior. What then, is a typical course load?
These numbers seem pretty darn high to me. I almost never heard of anyone having more than 7 academic classes and 2 PE classes. Normal classes are 3 credits, PE is a half credit (not the whole semester and not as often).
To take more than 7 classes when I was there (>21 credit hours) you had to get special permission. I did a double major and only had two, maybe 3 semesters with more than 6 academic classes.
A typical load is 5 classes first semester 4 dig year, 6 after that, and often back down to 5 firstie year for those not silly enough to do a double major/take classes "for fun"
Don't get me wrong, it's a lot, but for anyone willing to put in the work and get help, it is doable. Some excel and actually sail through the academics. Others spend every spare second getting extra help, but they make it.
Struggling with the harder work load is normal, and it's great to experience it in high school, when it's easier to figure out how to handle. The deciding factor between success and failure at USAFA is not generally intelligence, but rather work ethic and grit.
To the OP,
USAFA likely knows how hard your high school classes are and probably even a bit about your college classes. They will re-weight your GPA accordingly.
However, try to figure out WHY the harder classes are lowing your grades. Is it the way the material is presented? Are you just not understanding? Or is it that you haven't had to study much to get As until now, and don't really know how (this is VERY common at USAFA). Really think about it and try to adjust. Get some extra help (other books, tutor, classmates etc)
Good luck!