I mean, just to give you some hope, I think I left undergrad with like 3 or 4 Ws, and I still got 4 acceptances into med school lol. Don't worry about it so much. Schools look at the whole picture (grades, MCAT, volunteering, shadowing, personality), and they give you an opportunity at most interviews to talk about "weak" spots in your application. Just be open and honest, and speak about how it helped you grow as a person and how you've used that experience to perform and time manage better in your other classes. I think most schools will just be impressed that someone who was 15 at the time was mature enough to push for harder than high school classes. Good on you for being proactive.