I think this song is about a girl who struggled through a lot of things. After a while she starte to feel like nobody listened and verybody lied. She didn't want to tell people the truth, because she didn't want to face the truth herself.
The truth was that she was doing it all to herself, she made everything bad by looking at it that way.
Then she saw how people enjoyed life even the little things that make a difference in how you feel, and she realized that the world was not so bad after all. When she realized that, everything opened up to her and she saw clearly how easy it could be to just be happy with what is an what she had.