Lately I've been increasingly annoyed with the kids that I live with.
Could you explain to me why these kids annoy you?
They are always fighting with each other. That bothers me a lot.
I'm sorry they irritate you, but kids will be kids. They are just playing around and having fun, and you should give them some more time to enjoy that. But if it gets too bad, of course speak up so they know the limits so they don't annoy you more or hurt themselves.
They like to bang on my door on purpose and I have to tell them to stop it. It is not nice at all.
While they are annoying you a lot, you need to be willing to be patient with children. You were probably annoying too at their age to someone else and their patience kept you from getting yelled at constantly-- you need to repay that by now doing the same to these children. You could always tell them that they are annoying you if you want to try and get them to stop.