I hate my best friend but she loves me

I met my best friend this year. She was nice at the beginning but she has turned out to be a rude, homophobic spoiled brat. I know, I sound horrible calling my "best friend" that but she really is. I go to a school filled with kids who are narrow minded. My friend is one of them. Recently, another girl moved to our school and I became friends with her. She doesn't like her. My friend is constantly talking about how others are bossy when she is extremely bossy her self. She acts sassy when she can't pull anything off but she is so hypocritical. Recently she got into a fight.
"Why does it matter that you get here first?" One girl said. She was getting in front of people by pushing. "We're all going to the same place." She said to her, I wanted to say that she needed to stop that because my friend is always doing that. Then when she left, she started talking crap ago the other girl. She thinks just because she is my friend she can just hop in front of me while we are in lunch and I'm hungry so that pisses me off. Then we were having some free time and we were walking together. There's this thing called "double dating" at my school where 2 people walk in unison. "Oh cool, you guys are double dating!" I said. They were both girls. She said," ew, that's gay!" And started laughing. I was super upset. My mom taught me to accept everyone no matter their sexual preference or anything basically. Everyone at my school uses the word "gay/lesbian" as an adjective to describe an object or other. I hate my school and everyone so much. Then she lies of me. She promised me a mini bag of chips for my Tupperware of hot Cheetos and she said ok. The next day she pretended she never said that. I hate her so much and recently she asked me to hang out at her house. She loves me so much and calls herself my BFF but really I think of her as a person just to hang out with when I'm bored, the new girl is really my best friend. Ugh, I hate my school so much and I don't fit in.