2. Is it the inability to convert the thought into action?

Being talented doesn’t actually mean that all of them are extroverts to show out their talent bravely in front of everyone. There are people who have got new ideas to bring it into action but feel shy to expose it as they are introverts.

3. Is it because of fear of failure?

It is a most common mistake done by everyone. People tend to guess the result before making it an attempt to showcase their talent. And if they are new in discovering something new they will be always having the fear of failure or they may think that, what if people take it negatively. This kind of an attitude will always result make a talented person to hide behind the bush.