why is it important to overcome communication barriers ?

I have a quite introvert personality and i mostly prefer being alone and live in my own space. Sometimes i wanted to express my feelings but the communication barrier seems so heavy that i always step back. But many people i meet with suggest me to be open and outspoken. Why is it so important to overcome the communication barrier and move in life.
I have a quite introvert personality and i mostly prefer being alone and live in my own space. Sometimes i wanted to express my feelings but the communication barrier seems so heavy that i always step back. But many people i meet with suggest me to be open and outspoken. Why is it so important to overcome the communication barrier and move in life.