I'm not going to talk to my roommate before I break my lease
Why would you break your lease?
My roommate is a very negative person, he makes me feel uneasy.
It can certainly be uncomfortable living with a negative personality, but you should talk to him before just breaking your lease. Maybe he doesn't realize how he's making you feel. A lease is a legal contract, and breaking it could cause you long term financial troubles.
Nah, I just want to make it awkward for the both of us.
I really think you should avoid any trouble and just have a chat with him about this.