Why is my girlfriend so mean to me? (Sorry this is very long)?

Anonymous
When we first started dating which was over the summer she was sweet but then on the first day of college she ignored me and hung out with her friends instead. She used to say I'm cute but now she doesn't anymore and she keeps telling me that she wishes that I was taller. Although I am already taller than her. She also doesn't know when to keep her mouth shut bc she says things that are very rude or unnecessary like "I'm more athletic than you, and its funny bc I thought guys are the more athletic ones" which is really sexist. And I am in way better shape than her too I work out a lot more than her and she plays volleyball (she constantly stumbles, falls, misses, and sucks at it and her teammates think she's a bitch). She once called me a fatty over Skype when I made myself some popcorn yet I'm in better shape than her. Whenever I confront her rude behavior she always cries and plays victim making me look like the bad guy. She also never gives me any affection because "my previous boyfriend didn't give me any" okay so I should be punished for something that I didn't do? She also prefers to hang out with her guy friends more than me and she even told me about borrowing a jacket from her guy friend bc she was "too nervous" to ask me. Why did she even need to tell me that? She is always upset over something no matter what I do for her. I always try to cheer her up but she never does the same for me when I'm in a bad mood. She also once called me unattractive while laughing about it and she keeps telling me how hot Justin Timberlake is and even has him as her phone lock screen. Yet she got angry at me for using a movie poster with a girl on it as my lock screen which was not sexual in any way. For my birthday she made a birthday post but it wasn't very nice bc she said "you're the biggest nerd I know. You're a dork and a dweeb but I love you." And it hurt my feelings because my female friend made a much nicer birthday post for me. What should I do about her?
Why is my girlfriend so mean to me? (Sorry this is very long)?
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