To our OP: what should the average GPA be in your opinion? Average on a bell curve with a 4.0 scale would be right at about 2.5. If the average GPA is significantly higher, then grade inflation is the likely culprit.
I am reminded of a T-shirt I have seen several times on the students at Hillsdale College in Michigan: "C+! Hillsdale College: Where your best hasn't been good enough since 1844." I think the average GPA there for graduating seniors is around 2.6 or 2.8 (in a good year).
OK, enough of fencersmother's musings. Now you may be already too late for this year's application cycle. However, this leaves you almost 2/3 of a year to get yourself to community college or UCCS or Colorado College or some other place for remedials, revisions, etc. Get that Math in (and get good grades! S.T.U.D.Y.!!!!), Physics, Chemistry, English (like, learn to spell tier. {fencersmother is being a nooger today}, computer stuff... you get the idea. Take the most difficult coursework you can which your work and reservist schedule will permit.
On the subject of "hating their lives at USAFA:" Well, golly! It's hard academically, demanding physically, and there are rules. Of course! It's not like the six year plan at PennState (with vomiting as a major from Thursday night through Sunday afternoon). Do some really hate the experience there: sure. Do some love it? Sure. Looking back, many will say it was the foundation of the lives as adults, and probably most couldn't consider ever having gone any place else for "college."
So, here's what it boils down to: if you want USAFA, then gear up and go for it. Prepare yourself, nose to the grindstone. Are you in a sport? A physically demanding sport? Keep it up! Do you have a job? Do your best! Are you in college now? If not, REGISTER TODAY. Will you get an appointment? Maybe. But know this: if you don't apply (and apply yourself), you have no chance. So, apply!!!! There are only two responses: no, and Y.E.S.!!!!!
Best of luck! (Now get to class!)