Like mentioned by other users, it would be Pearl and Not Like the Movies. Another one that in my opinion I find underrated would be "I'm Still Breathing." I think we can relate to all three songs.
Pearl: Possibly meaning that no matter what happens, you have the courage to get through it.
Not Like The Movies: Maybe we had plans for a relationship or that special someone that possibly didn't work out.
I'm Still Breathing: Maybe she is describing the feeling of how even though it is hard, but at least she tries her best to get through the situation.
I listened to Pearl over 275 times on my iTunes account and I'm Still Breathing over 200 times. I can easily relate to Pearl and I'm Still Breathing to real life.