Honestly this is a very hard pick for me. There are a lot of songs that have deep meanings, but if I had to pick one right now it'd prolly be I'm still standing by Elton John.
The chorus to be exact
Don't you know I'm still standing better than I ever did
Looking like a true survivor, feeling like a little kid
I'm still standing after all this time
Picking up the pieces of my life without you on my mind
It sometimes brings me back to the time when I was going trough pretty hefty depressive thoughts. And I did consider few things. But in the end...I'm still standing.