Mainstream pop/rock songs about loneliness, feeling invisible, trying to keep strong?

I'm creating a playlist on my iPhone of songs about these issues.
Here are songs I already have:

Simple Plan:
Welcome To My Life
Me Against The World
Save You
Astronaut
Anywhere Else But Here
This Song Saved My Life
Perfect
Jump
Shut Up

Gotta Be Somebody by Nickleback
Miserable At Best by Mayday Parade
Nobody's Home by Avril Lavigne

Any other recommendations?
Please don't judge my taste of music.

I DON'T want songs about being in a relationship as I've never been in one so I can't relate.

Added (1). That song isn't my sort of thing… I hate rap and it's too Top 40 for my liking

Hall of fame

What doesn't kill you - kelly clarkson
When your gone - avril lavigne
Lullaby - nickelback
Every river -?
Whiskey lullaby - brad paisley
Not afraid - eminem
Good intentuons - dappy
The gamblr - kenny rodgers
Sing - gary barlow
Don't stop believing - joureny
Sing together - train
Read all about it - proffesor green
I cry - flo rida
Some nights - fun
Wagon wheel - mumford and sons
Hall of fame - the script
Impossible - shontelle
Just a dream - nelly
Loser kid - busted
No regrets - dappy
Space bound - eminem
Teenage dirtbag - wheatus
Home - westlife
Whiskey in the jar -?
Wings - little mix

Hope that helps.

Invisible - Disciple
Not Alone - RED
Hello Alone - Anberlin
Faceless - RED
Ment to Live - Switchfoot
Hold On - Abandon
Don't You Know You're Beautiful - Seabird
Be Somebody - Thousand Foot Krutch
Mess of Me - Switchfoot
How to Save a Life - The Fray
Over my Head (Cable car) - The Fray

Victim by AX7
Tonight The World Dies by AX7
Danger Keep Away by Slipknot
Till We Die Slipknot
Dead Memories Slipknot
This to shall pass by Ok Go