What do I know about language? absolutely nothing!

I have come to realize, the more I learn(particularly in TOk) the less I actually know. For goodness sakes I can not even understand what does and does not make a language, something which I have been learning for my whole life! However I do believe that language is subject to perception. For example I may believe body language is one of the most important aspects to a language, while another person would completely disagree and say WOW are you ever stupid that has nothing to do with language. I suppose there is no right or wrong answer, unfortunately for me this is a hard concept to catch hold of because I like it when things are "black and white", or "cut and dry" if you will. Oh well c'est la vie!