Reflecting about peolple

I'd love to start this post with something that happened to me today. Currently, I'm preparing myself for an important audition. I'm a musician btw. The thing is that one of my roommates is going to take the same audition that I will and it's important to say that our relationship isn't necessary good. Currently, she's like the boss in an orchestra while I am not part of any. However, I could borrow an instrument which comes directly from the orchestra she plays. Today, I got called by her and she said she needed that instrument. Just like that and since I am not part of that orchestra I can't complain about it. The worst thing is that the audition will be in two weeks and I have to start again with a totally different instrument even when I know they actually don't need that instrument. That made me feel angry. I do not consider myself a bad person but I started feeling bad things and looking for ways to harm her, not in a physical way obviously. But then I thought. Come on! The best way you can take revenge is winning that audition. Yet, I can't stop thinking why there is people who is willing to do bad things just to pass over you. Even if you have a rightful way to prove you are better than him/her. Just, there is bad people.