Why are girls always angry with me, not others? What is the psychology of girls?

Maybe she doesn't like you very much. You are just a stepping stone at her feet, a little comfort when she is empty. She's only dating you now because she hasn't found the right person yet. Once she meets a happy boy, she will abandon you, her temper will become better and gentler, and sometimes she will stick to you like a naive girl. She won't keep pulling you and hacking you, but will always pay attention to you.