Am I a terrible daughter and how do I get better?

I was watching this document about children who have lost their parents, homes, everything and I realized that I am a really bad daughter. I'm disrespectful, I talk back, I curse and I'm just all around terrible. I'm really mean and unfair to my brother and I call him names and I'm lazy. I don't clean and I don't pick up and I complain a lot. I feel so bad. I want to better and I want my parents to be proud of me. How can I get better? I don't want to be a bad kid. I'm 16 btw