No. I don't think it's possible. People who have never been depressed can't understand what depression truely is. It's always oversimplified to 'being sad.' But the thing is it's always more than that. And I think the hard part of understanding is that depression affects everyone differently so it's that much harder to understand. I've been on medication for a while now and I'm starting to feel better, but before it wasn't just the unending sadness/misery. It was the constant over sleeping, the lack of energy, the lack of motivation. I had all these things I wanted to ddo, but physically couldn't. I even had one of the 'I literally can't move even though I want to' episodes. I never really understood what people meant when they said they literally couldn't get out of bed. And then I experienced it and I finally understood.
Honestly though I think it's just not possible to understand when someone goes through something you never did. You can empathize, but like I've never been in the military or been in war. I can empathize with people who had to kill other people, watch many of their friends die and constantly wonder when they were going to be next, so much so that they have PTSD. But I can never really understand the struggles they face.
The only person who understood and who I could trust was my ex, who was also depressed and suicidal. He never made me feel bad for being suicidal. He was just there for me. When I told my family they all guilt tripped me into feeling bad for having these feelings with 'but think about how I would feel.'