I know of introverts who dress all in black, some even with punky hair. The message is clear -- keep your distance! They are letting the world know that they don't want interaction. With other kindred spirits, they live cocooned in a world of creativity rich in music, art, and fantasy. But that's not me.
I know of other introverts who quietly and steadily do their job. They live contentedly taking pride in their tremendous ability to manage details and in their immense capacity for concentration. They prefer to work alone and they accomplish much. Sometimes they enjoy being around people, and listening to others talk, but generally you will find them in a quiet corner talking details with another person like themselves. The don't need much interaction. If communication is required, they prefer that it be written. When necessary they will frugally measure out a few spoken words. My husband (ISTJ) is like this, but I'm not.
I know of some introverts who spend their lives quietly serving people. These (ISFJ and ISFP) practical people oriented introverts gravitate to occupations where they can quietly interact one on one in fields such as health care, child care, management, and homemaking. They concentrate their energies on doing things for people. Quickly tiring of relating, they retreat into action. "There is always something that needs doing!" is their motto. That's not me either.