Being shy and being introverted are two different things. Extroverts can be shy too.
The difference is that while extroverts are energized by parties and other functions introverts, Introverts may enjoy social functions but they are emotionally and physically drained by prolonged stimulation.
In short: an introvert is wired differently and thus cannot become an extrovert though many function very well in extroverted settings.
In answer to your question:
I am very good at socializing. I have given speeches and hosted events without issue. The difference is that I need several days of non-stimulation to feel energized again afterwords.
To give you an idea of how well introverts can function in society here is a partial list of ones you may have heard of:
* Joan Allen, actress
* Candice Bergen, actress
* Ellen Burstyn, actress
* Glenn Close, actress
* Clint Eastwood, actor
* Harrison Ford, actor
* Tom Hanks, actor
* Helen Hunt, actress
* Diane Keaton, actress
* Jessica Lange, actress
* Laura Linney, actress
* Steve Martin, actor
* Gwyneth Paltrow, actress
* Michelle Pfeiffe, actress
* Julia Roberts, actress
* Meg Ryan, actress
* Meryl Streep, actress
* Noah Wyle, actor
* Abraham Lincoln, sixteenth president
* Sir Alfred Hitchcock, film director
* Michael Jordan, basketball player and celebrity
* Thomas Edison, inventor
* Grace Kelly, actress
* Gwyneth Paltrow, actress
* David Duvall, golfer
* Laura Bush, first lady
* Bill Gates, software pioneer
* Candice Bergen, actress
* Clint Eastwood, actor/director
* Charles Schulz, Peanuts cartoonist
* Steve Martin, comedian/actor/writer
* Harrison Ford, actor
* Michele Pfeiffer, actress
* Katherine Graham, late owner of Washington Post, author
Also on the Science front:
Alfred Adler, psychoanalyst
Albert Einstein, physicist
Thomas Edison, inventor
Jane Goodall, naturalist
Carl Jung, Swiss psychoanalyst
Keep in mind that this is a partial list