They look away quickly as if nothing has happened. Girls, what is going on here?

Anonymous
I see woman in the street, on the bus, train etc. I see them looking at me out of the corner of my eye, or in reflections, so I try to give eye contact with a soft smile - but 98% of the time they look away quickly as if nothing has happened. I decided enough was enough, the other day I was on my way to work and I caught a girl looking at me, she gave me a slight smile, so I softly smiled back. She was sitting opposite me on the train, so I sparked up a conversation, small talk about what she was reading. I got one worded answers, and she seemed slightly nervous talking to me - so much so I gave up and went back to staring out of the window.

Another time, A girl looking quite hot walked towards me, I had already caught her eye, so I said hello, she gave me a sweet smile, I asked how she was, she smiled and seemed really shy, but she just walked off.

I don't get it...98% of the time, girls just seem to want to look at me but they don't want to make small talk..it's bugging me because I like these girls I wanted to talk too and hopefully meet up with, but I can't seem to open them up or make them hang around long enough to hold a decent convo with. Any ideas here would be a great help!
They look away quickly as if nothing has happened. Girls, what is going on here?
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