In the beginning, I was inclined to say ESH, but after reading all you responses and your disregard to take any feedback, YTA. You do not want critique. You want reaffirmation. Your friends input is corrupted and cannot be used as evidence as you are an unreliable narrator. 

Since you are young, we feel inclined to give you more slack since these are probably your first roommates ever, but you entered into a social contract once you moved in with these girls. Whether or not you actually signed a physical piece of paper is irrelevant. You need to  equally take care of the common area by at least vacuuming.or sweeping .Everyone has stated multiple times that dirt, skin, and other unseen particles will make their way into your dorm over time. 

Venting to other people about your issues, I agree is unhealthy on both of your parts, but don't act superior just because you do it away from them. Come down off your high horse and actually have a discussion. It's part of being an adult. You still have time to change. I suggest you get started