Seriously, why aren't any guys paying any attention to me?!

I'm so confused why guys don't talk to me. And I'm also getting really frustrated by it! Putting all modesty aside, I have beautiful red, straight hair with pretty green/blue eyes and no freckles. I also have big boobs and I'm not fat. I don't cake on the makeup, I usually keep it natural looking. I'm definitely not ugly and I don't dress slutty/trashy. And people usually think I'm pretty funny, I might just be a little shy in the beginning, especially around guys. But my shyness is almost a direct result of guys not talking to me/showing absolutely no interest. Please help! I'm 20 years old-- I feel like this is a prime time for guys to be talking to me! What should I do?!
Seriously, why aren't any guys paying any attention to me?!
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