I’m afraid shyness and introversion are quite different.
I agree that shyness can be overcome. Introversion is a preference for solitude, at present it is being defined as a person who recharges and relaxes best alone while an extrovert recharges and relaxes best with others. Introverts can be shy or not. Shy people can be extroverts waiting to be freed or introverts who can be helped to be more comfortable with groups but will remain introverts.
They are not identical terms, true.
Their overlap is fairly large, however.
Nevertheless, I'm not all that thrilled to go on and on about this topic. It doesn't excite me that much.