Justafaceinthecrowd

I swore i heard a song on the radio a few months ago in the middle of the night when i was driving but i can't find it anywhere. The only part i remember clearly is it saying I'm sorry i didn't know me then like i do now. It sounded like a song about trying to leave after pretending to be happy for so long. It seemed to be about someone who lived their life doing what everyone else wanted them to do even when they knew it wasn't what they needed. Does anyone know what song it could be?