"The Tower of Babel
Now the whole earth had one language and one speech....Therefore its name is called Babel, because there the Lord confused the language of all the earth; and from there the Lord scattered them abroad over the face of all the earth."
End Of The Bible Quote
So the bible suggests that language is natural. It was created by God, not by man! I think there is some truth in this. Humans here would not be that different from chicken, baboons etc. These animals seems to have a natural language. No one teaches a chick what sounds means, but they understand it very well. Same is true, at least to a certain extend, for humans. If you are asked to recall when you first understood what words means, you find that you can't, both the 'mother tongue and even the secondary language! We seem capable of understanding language without any conscious efforts at all, much like a chicken will do!
Otherwise how do human beings agree on what yo call what in forming a language? I think languages develop like nick names do, and children are the ones who create most of it! When we are young, we form words to describe what our parents didn't teach us. Our fellow children easily adopt our language. Not so with the adults. They prefer not to add to their vocabulary. But when the children grow up, they keep on with their language and teaches their children etc. In this way, language grew a bit unconsciously.
But in my view, we should try to create language more consciously. We should eliminate synonyms, antonyms etc. We should eliminate abstract nouns, and there should be only one way of defining a given word. Our languages are imperfect, but we pretend they are, as if they were created very consciously!