family

My entire family is very close except me and my younger brother. He is four years younger than me. We used to get along ok, but now we always argue. It's usually my fault. I find myself so frustrated and annoyed by everything he does. I'm not sure why I'm like this. I don't know what to do. He hates me and reasonably. I don't blame him. I know I'm wrong but I don't know how to change.