what makes me angry?

I will tell you a thing, that makes me very angry.
One thing, which makes me furious is, when my little brother or my little sister want to play with me, when I have to do my homework. They are a pest. For instance, when I have to do my english homework, they ran into my room and scream around, that I have to play with them Monopoly or other games. Then I get really angry and tell of with this little devils. And after this, they go to my parents and tell them under tears, that I punched them. They are damn liars! I'm so angry then and can't concentrate me for the homework. And when its the next day and I had english lesson and the teacher asked me for the homework and I didn't do it, I'm sad. And when I'm sad I have to eat and when I eat too much I'm angry of myself at the end. I know, maybe it's a little bit stupid, but I can't change it. I think many people have the same problems and I think I must get me a key for my room, then I have my silence.