On the
shy bit you have to work out - if you are not good with your words,
are you not good at speaking or expressing your feelings? If it is
the former, you could write your thoughts and feelings into letter
form (at least you know what you wrote is TRUELY what you wanna
say, won't stammer, etc.).
If it is about expressing your feelings - try to emphasis your
loving ways on action and behavior. People who ain't good at words,
work on your body language. Best if she is Cancer, Scorpio or
Pisces, their intuition & psychic sense will detect your
actions generally. 
P.S: These are tools to be used - DO NOT USE them as such on
individual level. They must be combined with other elements to make
your chase a more effective measure. And of course, regardless of
what you plan to do, you still cannot escape trying to work out on
your shy part and your quiet nature.
Cheers
