Lately I've been wishing my brother was dead.
Why would you wish such a horrible thing on your brother?
I'm getting sick of him throwing his waste into my room because he thinks that's the only place to throw trash
You shouldn't wish death on someone, especially a loved one. Talk to your brother about your issues with his behaviour.
I've thrown his stuff into the sink and the toilet in hopes he will learn the dumpster is the only place to throw trash.
You need to have a sit down with him and explain to him what he is doing is extremely disrespectful. Hopefully you could fix this issue, and you will no longer feel this way.