A B in college is not the same as a B in HS. It’s a GOOD grade. In fact, a HS student who gets a B in a COLLEGE course does very well and is clearly ready for college.
College is harder than HS, and is supposed to be. Many freshmen who don’t go to office hours till three days before the midterm, think there’s no hw bc it’s not graded, think there’s extra credit (there isn’t), etc etc, are in for a rude awakening, typically after Fall Break when what was enough in HS turns out to have been a very naïve way to be a college student. You learned that earlier than most and should be able to hit the ground running.
You typically won’t have to submit an official transcript till you enroll. You will however have to either list ever class taken with the grade (stars/srar…) or have your counselor send an unofficial transcript with the school profile, grading scale, etc.