For me it's Against the Voices by Switchfoot, specifically the intrusive thoughts I get with my anxiety that tell me everyone hates me and I'm unwanted.



Start the day against the voices
The ones that tell me that I'm wrong
I hear them now
Screaming their delusions
I close my eyes and they're gone


In my mind I hear the voices
In my mind I have my doubts
Burning fears, these ghosts and apparitions
Only a whisper can drown them out, yeah


If they ain't singing
And they're just talking
Let them keep talking to themselves


'Cause everybody knows
The hardest war to fight
Is the fight to be yourself
When the voices try to turn you into someone else
Someone else