I personally know many, many quiet girls that are married quite happily. When looking around at the girls still waiting in my age group -I can honestly say that we are defintely not a group of shy and quiet kids – QUITE THE OPPOSITE (pun intended) we are a great bunch of talented and successful girls to whom Hashem has not yet bestowed the Beracha of marriage.
However, one thing I would recommed – if you are a quiet kid – or even not so quiet and you see the shadchanim are not calling – you gotta take the ball into your court – and start calling and meeting shadchanim – get the word out that you wanna get married! Get out of the house – go to every wedding ur invited to – and parties whatever – you gotta be out there and be seen – so people know you are still around and looking!