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The human consciousness is a very strong tool in human armoury. It is what makes man a superior being. In this deep state of mind, you will be amazed at what the human mind is capable of pulling off.
Humans appear to have distinctive features, because that's how you separate the wheat from the shaft. The mind controls how humans act/behave on outside, depending on how toughen your mindset is. Some sharp, and some others blunt, now it is this bluntness of the mind that brings about shyness.
Shy people tend to have this inferiority complex, that makes them question their every actions, even before they are carried out. They look down on themselves as not being able to match the sharp minded ones, which is majorly not their fault. Inferior complexity in humans come through different factors/channels, like environmental oppression, example is growing up/living in an environment where your financial capabilities does not match that of the people around you, or by seeing that your body structure is nothing compared to that of your peers...... Then there is exposure, when one grows up in a seclusive manner, that is confined to a particular region or practice, wchic when exposed to the real world, discovers that he still has a whole lot to learn.
These factors prompts the mind into doubts, which dwindles the rate at which decisions are being made, that therefore brings about shyness.