Refocus your efforts. Your focus is ALL As. This should have been a goal from the very first day at college.
“How can I make my application stand out?” - You do NOT need to stand out. Having high GPA, decent MCAT, medical ECs and being OK socially are sufficient enough.
“Should I minor in anything or join a certain club?” - No need for these either, unless you want to. Since you do not have a minor now, it has not been your goal. Minor or club will NOT fix your GPA, they will NOT compensate for the low GPA .
“What can I do to start preparing for the MCAT now? Or am I still too young to be worrying about that?” - Yes, too early to think about MCAT.
Your priority is your GPA. Start checking things like Med. Research lab internship, volunteering. These opportunities were greater for my D. at her college than anywhere else.