Your school’s guidance counselor is not being very realistic unless they want a top student forced to take a gap year due to their bad advice - it’d be pretty damning for a top private school, right?
You have two choices:
1° build a real college list the way top American students do, with 2 “likelies/safeties”, 3-5 “matches” (<- that means 50/50 odds of acceptance) and as many reaches as you wish or can afford.
Kids who only apply to Top 25 universities/LACs more ofthen than not end up completely shut out due to their sheer hubris.
OR
2° Shot Gun Ivy+ colleges and NESCAC/Claremonts AND ALSO apply through UCAS with two solid safeties there.
Anyway, any college with sub 25% acceptance rate is a lottery school for all, including Americans, but even more so a British student. Keep in mind that’s lower than Oxbridge rates. So, your odds of getting into, say, Vassar, as an international, are probably the same as getting into Cambridge. Your odds of getting into Wellesley or Pomona or Yale are wayyy lower than that.
If you don’t want to be shut out, you need to apply widely.
That means finding good Honors Colleges, such as USC Columbia’s, Penn State Schreyer’s, UMichigan’s LSA Honors. Those are really difficult to get into but if you apply to a few you have a shot. The essay topics tend to be academic, which should be your forte, and you’d have all of July to write them.
That also means finding guaranteed Honors Colleges or highly (but not below 25%) selective LACs that you like and can afford - perhaps UAlabama Honors+University Fellows or Mount Holyoke College or StLawrence or St Olaf or Dickinson…
https://www.shc.psu.edu/
https://www.sc.edu/study/colleges_schools/honors_college/
https://www.pomona.edu/
https://www.mtholyoke.edu/
https://www.wellesley.edu/admission
https://honors.ua.edu/programs/university-fellows-experience/
https://www.utdallas.edu/mcdermott/
https://wp.stolaf.edu/
https://www.stlawu.edu/
https://www.dickinson.edu/
https://www.vassar.edu/
Get a Princeton review’s guide to the best colleges. Start reading.
US colleges want leadership - not tutoring lower grade students (which is fine if you’re aiming, say, for Iowa State or Cal State Chico, including Honors), but building a whole tutoring operation for students outside your school, with a dozen other students following your lead. Or being a nationally-recognized dancer, musician, athlete, chess player. Internationally-known is even better of course.
Since you’re very good at French, take the SAT Subject in June. You’d probably do well with the English Literature test. Each test is 1H and fully multiple choice.