How do I make myself like men more, and not to dismiss them in social situation?

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I am a 40 year old female professional in the dating market. My friends had always told me that I had that 'little girl' quality which I must not lose. But I think I have finally lost it. I used to be able to look at guys with bright eyes and enthusiams. Now in social situation where I am supposed to meet guys, I find myself talking to the women, and dismissing the guys as just another guy. I know that this is because I had felt hurt in previous relationships in which I was disappointed in the guys. I don't hate guys and I do have good male friends. I know there are good guys out there, but I just can't make myself behave the 'right way', that is being friendly to the guys(strangers) in social situation. And I also don't see the guys that I meet as potential dates/husbands/white knight/protector etc anymore. They are just another guy. I know that in the past, guys got crazy about me because I was crazy about them. With my current attitude, I am destined to spinsterhood. Please help.