<human>: Can you condense the text into a few key points?

I'm 18 M. So there's this girl (18 F) that I kinda like, but recently she has been ignoring me for some reason. And I don't mean like simply not noticing me or anything like that. I mean like flat out "I-know-you-are-there-but-I-choose-to-ignore-you".

She seems quite friendly, and talks to quite a few people. But she seems super awkward when talking to me. And she doesn't even look me in the eye most of the time. As a result, I didn't really get to know her a lot. I assume she doesn't like talking to me all that much.

Today, I was sitting at some benches looking at my phone. I'm quite tall with long legs, so I was kind of blocking the path between the two benches a bit, and when that girl tried to cross, she didn't even ask me to move a little to make it easier for her. She just tried to cross over my legs, and even stepped on my foot by accident. And the worst part, she didn't even apologise, or even say hello. She didn't even LOOK at me - she just stared straight ahead to where she was going. 

Now, I'm not the narcissistic type who thinks every girl in the world likes me. If she doesn't like me, fine. But she doesn't have to ignore me like that. Plus, I didn't even do anything to piss her off. I didn't act all douchey to try to pick her up, flirt with her or anything (unlike some other guys). I was just acting like a normal, friendly person, and looking out for signals to see if she is interested or not. Apparently not I guess, but I have no idea why she is behaving in such a weird manner towards me. Definitely not something I did.

According to many people (guys and girls), I am quite the looker, and many girls have had crushes on me. So I don't understand why she wouldn't even want to make friends with me.
<bot>: A girl I like is ignoring me (on purpose) for no reason. I am good looking, and didn't even do anything to piss her off. Why?