BFF and roommates.

Ashley
A very good and close friend of mine had agreed to let me stay for a year in her small place. At first it was super fun and exciting. But 3 weeks later and I'm already getting annoyed very easily. I don't know why, but everything she does makes me wanna roll my eyes and walk away. It's starting to feel like she's acting like she's better than me but I don't know. Please help. I don't wanna lose her as a friend but I also have no where else to live.