I was just coming here to respond to your post and saw what @DadTwoGirls oGirls wrote and cannot agree with him more.
The example I can add to that is this —
Just because you’re one or two math levels behind the kids in the top track, doesn’t mean you’re any “worse” than them or any “less qualified” than they are. Trust me, they are not all earning straight A’s. As @DadTwoGirls you have 1 B in your entire career and plenty of rigor. That says a lot.
While we are OOS, we generally tend to send a good number to UM. While this year we are sending more to Wisconsin than to Michigan (Wisconsin seemed to let everyone and their brother in from our school this year oddly enough), but anyway, my son was in the top math level having finished through Calc 3 w/ one semester of Linear Algebra. Most Seniors maybe have Calc 1 when they graduate. I think there was 1 student who was even further ahead than him but let’s not count him. Anyway, from his math class of about 18, only 2 were accepted into UM for Engineering, 2 were flat out rejected, and I think 1 was accepted into LSA. However, in the other math levels, which were basically students in BC or AB which as I said most seniors take, that made up the remaining 20+ kids that were accepted to UM mainly in LSA, no one else into Engineering, other than the one kid who was doing the independent study in math that I mentioned was a year ahead. Obviously, we’re not in state so that changes some of the demographics, but we had a huge chunk of kids from my son’s math class WL at Michigan and some from the other classes as well.
They are not looking for every kid to be a replica of the next. Find something that sets yourself apart from the rest. Not everyone in those higher math classes all have the same grades, so they may not all get in, or those that are in those tracks are often the ones interested in Engineering and if that’s the case, then they will be applying for Engineering and you said you are not interested in that, so that will help you. They also may be applying to other universities.
But the bottom line is, your competition is yourself. Write the best essays you can, don’t worry about the others, and focus on you! You can’t worry about them anymore than they can worry about you.
Work on improving your score and get it up as much as you can. SAT math is generally considered more difficult than ACT math although there is more time per question. You may want to take a practice ACT and see how you do and if it’s worth attempting to take the ACT. You may do better. If you can get down the time, and the English strategies. The math tests generally through Geometry with a few questions now related to Stats/Prob, and I can’t remember if they’ve started to make it slightly harder with any Trig related stuff, but you can definitely check the breakdown. It may suit you better if math is where you need to do better. Khan Academy is also something that’s free that a lot of people use to help study for the tests.
You can do it! Just make sure you also have good safeties as options.