To be clear, having emotional issues does not make you inherently any less "promising." Everyone has emotional issues, not everyone identifies or attempts to treat them through the clinical pipeline (although they should).
In fact, the ones that repress their issues are the ones all of these evaluators are
actually worried about, because those are the students that smile through the pain until some tired administrator breaks their spirit and they jump off the roof... and then everyone at the school does a whole lot of hand-wringing and "praying for the family" hoping nobody comes knocking about what's going on within the program.
It's well-known medical students are extremely busy with medical school, to the detriment of all other areas of life. If life is no longer worth living, that's a reflection of the life afforded to the student by the school. It makes
sense to investigate... and so there's a risk analysis for admissions that is front-loaded in identifying students who would be least likely to crack under the pressure.
The best advice I'd received early on in my process was what
@Mr.Smile12 said: this process is not a confessional. This was very different to what I had heard up until that point, which, for the last several years, was "be as honest and upfront about your 'story' as possible."
My view as an applicant was that an FBI agent would sit with your application for a full afternoon to ensure each word is true to your actual life, and that my "story" meant a literal chronological recounting of everything that happened to me. I think changing my mindset from "forensic investigation" to "job interview" really helped reinforce that the horizons of this process are closer than you think.
I really liked Dr. Angela Collier (astrophysicist, but still a fantastic and relevant scientific communicator) who offers a great perspective in her
video:
I don’t think it’s appropriate to mention family issues or mental health struggles in a personal statement or job application. It’s not that having them is bad, nor do I think it would necessarily harm your application—but it doesn’t add anything either. Your depression, for example, isn’t likely to affect your graduate school experience, and an employer doesn’t need to see it in your materials. If you require accommodations, that’s entirely valid, but the right moment to discuss them is after you’ve been admitted or hired. In my view, that kind of disclosure simply doesn’t belong in an application.