I think this song is about domestic abuse. She wants to escape, to go back to how simple her life was when she was a child, so we get the impression that she is little more than a child herself, perhaps she married at a young age. She hates what is happening to her, but she lives in fear of her children getting hurt, so she will take it all to protect them, claiming that her injuries are because she's been walking into walls, and are therefore self inflicted.