One time when I was still drinking, a man came to do some work outside my house early in the morning. I met with him, and even from a few feet away, I could smell the alcohol on him. It was probably seeping out of his pores, from the night before.
I remember it being a jolt to me... One, because someone could just as well some mornings have smelled that coming off me. Two, because it was this personal, unintentional window into his private life, a glimpse of what I perceived as misery, him struggling to get up and drag himself to a job he didn't really want to do. Of course it wasn't enough to make me change for quite a few years to come. But it stuck with me.
We think we are hiding it. But we most likely are not. Even if we are somehow "functioning", there's no way this is our best life, excelling, contributing, living the life of the person we were created to be.