Let's say things aren't going as well as you expected. Maybe she's left a sour taste in your mouth by saying something casually bigoted or small-minded, or you're getting the strong impression that she's not really interested in you, or you've realized that you have wildly divergent relationship expectations.
While there's some overlap between being shy and being an introvert, Cain spelled out the difference during her interview in TIMEsaying that "shyness is fear of social judgment and humiliation, and introversion is really preference for less stimulation. If you've ever stopped to think about it, some of the most powerful people in the world are introverts, like Mark Zuckerberg, Marissa Mayer, Hillary Clinton, and Barack Obama. Introverts are taking over and people are noticing - including those who run dating websites. Prostitute Marion
Zoosk offers ease and practicality and is pretty far from the Tinders of the world. Specifying the age range and gender that you're looking for in a partner does squat to narrow down your options.