I’ve commented on the Ds in your transcript already. That puts you out of contention at selective colleges such as Columbia despite your high ACT or SAT (I don’t remember which). The Future Physicians thing is not a boost to anyone’s application per se. It says either you raised money or had relatives pay for that information seminar. It’s for-profit – preying on kids/families hoping for some application “boost”.
You should focus on your GPA and less on top 20 colleges. That wastes your time and emotional energy. You need to be looking at schools that will realistically accept you and hopefully, help you to achieve med school one day. Wondering about Stanford and Columbia is a fool’s errand.
When you go to buy a house, you don’t tour all the multimillion dollar mansions first. Everything else later seems shabby. You’ve gone down the wrong path. You should be touring schools that specifically are realistic to gain acceptance. yeah Stanford is beautiful and Columbia is a great college. So what? Neither are realistic for you. Please focus on likely schools.