When anyone worries too much, too often, others do tend to sugarcoat. I might guess the GC has already tried to reassure you. You need to find some perspective here. Driving yourself nuts won’t guarantee anything.
What gets me is no mention of what possible college targets except some ref in the past to T20??
And, if you want pre-med, why all this fuss and muss? AP chem in junior year means you have a chance to show your performance through an academic year, maybe get a great LoR from that teacher, and maybe get a nice 5 on the AP exam.
Try not to get swirled up in the small things. When you have extra energy, use it to refine your understanding of what your possible targets do want to see. Get that info from the source, those colleges. Then, armed with some better sense of how it all should piece together, you can breathe a bit better.