The beauty of a "mental health" issue like depression is that you can control exactly when that healing begins.
Not really - if you have a mental health issue where you don't even have a process to deal with a situation that most people commonly can deal with naturally you can't just snap out of it. You need to build a mechanism to deal with it and that takes a lot to overcome even with help from a professional and the initial barrier can seem insurmountable when you can't see what is beyond it - can't even conceptualise what you need to aim for to overcome it.