I’m glad you overcame your shyness, which is what we learned the word “introverted” to mean back in grade school. However, that is not the actual definition of introvert. Please read the article I linked to above.
Introversion is not shyness, it is not timidity, it is one end of a spectrum which describes how people process the world around them. It has nothing to do with fear (thus “growing some” is irrelevant to the conversation). From the article:

“Introverts seek time alone because they want time alone. An introvert and a shy person might be standing against the wall at a party, but the introvert prefers to be there, while the shy individual feels she has no choice.”

We get the impression that most people are extroverts because, by their nature, they are the people that get the most attention. The introverts are the ones listening quietly, absorbing and analyzing.
I’m an introvert. I can hold people’s attention when I need to. I’m quite good at public speaking. However, I don’t need public attention in the same way an extrovert does; my needs are better met with private attention.
As an introvert, I don’t expect the world to change for me — I’m quite comfortable navigating the world as it is. I don’t expect people to change for me, but I do expect the people around me to try to understand other people. This is about basic social skills, but because of the nature of the problem (understanding people who are quiet and easily overlooked), it doesn’t get much attention. Don’t worry, introverts are just as busy learning the social skills necessary to deal with extroverts.
There are people with whom you work every day that are introverts, and if you expect them to operate like extroverts, they will be neither productive nor happy. Learning how to interact with people who have this kind of personality will allow you to get better work from them. If you have an introverted child, you need a different teaching technique to reach them.
The graphic is merely asking that you respect people for who they are and understand their needs. There are many things that people need help changing about themselves; introversion isn’t one of those things.