Why do women ignore me?

Since I was in high school, I feel that women go out of their way to ignore me. I'm kind of a shy guy and can reserved at times. When I meet new people, I always smile and introduce myself. Anyway... here are a few examples of what I mean:

-In high school, my friend introduced me to a few of his female friends at lunch. He introduced me to them and we all said hi to one another, but they started to tune me out after that and acted like I wasn't there.

-One time I was waiting for the bus with my friend in high school and a girl (that we both knew) came over to talk to my friend. She totally ignored the fact I was there and wouldn't even look at me and kept talking to my friend.

-In college, I was working on a group project (me, this guy and a girl) in class. After introductions, the girl completely ignored me and only talked to the other guy. When I kept trying to talk to her to make suggestions about our project, she acted like I wasn't there.

-Ran into an old friend at the college bar, and he introduced me to a table of girls he was hanging out with. They all said hi to me, but completely tuned me out after that.

-Yesterday at college graduation, I was standing in line waiting for everything to begin with my friend. A girl that we both new from class came up to us... but she only started talking to him and completely acted like I wasn't there until he talked to me directly sometimes and would make eye contact with me only when I said something.

I'm not a bad looking guy and I have a nice physique and good fashion sense. People say I do look serious sometimes, but I talk to people, I have friends, I laugh, and I smile a lot. I don't really give people a reason not to like me, especially if they are not trying to get to know me.

These are a just a few examples where girls have totally tuned me out. Have any other guys experienced this? Why do women do this?
Why do women ignore me?
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