One thing I learned about rejection is that if you get rejected, you're subconsciously rejecting them, too... you may paint a girl in an ideal and flawless light, but once you get rejected, those flaws will immediately come to the surface. I look back on some girls I got rejected by, and it's like... "she had a tank-ass, why did I like her again?" or "she was dumb as a brick" or "she was a prude" etc etc.

If she isn't into you, it's not meant to be and nothing you can do could get them to change their minds. But not to worry, there's always someone better (i.e. more compatible) out there.