Person With No confidence have loud voice

You have seen many people who are of your age or may be younger or older than you used to speak loud when delivering or discussing something which they have no knowledge about it.
Those who have lack of knowledge or they are empty from inside and have nothing good in their life are trying to use the way of speaking loud:
- They have their mind on another side and they dont have any concentration on their voice and they used to speak loud !!!!
why Such people are using high tone?
The reason behind it is that , people have loads of expectations from them and if they are unable to come up to the expectations, they used to find ways to impress others by speaking lie.
Why in this world people used to speak lie and why they exaggerate without having anything with them?
Stupid people, just by telling lie they think themselves as they are not noticed by other people lol :)