Revised "Guidelines writing"

I think personality can be discribed by this image because although personality is varied, psychologists classified them into "Big 5".

People always do something that I don't know his/her purpose. I've read about personality psychology in Wikipedia but it seems still can't identify all the  humans' personality. I think human's mind is complicated because of their own personalities. I am interested in why personality is complicated as people are all around me and sometimes I don't understand why people have such actions annd responses. Sometimes I don't even understand how is my personality looks like. I really want to identify humans; personality as I wanna know what people think and what I need to do or response with their actions. I think it is hard to identify all of the personalities because even psychologists can't identify all the personalities in human beings.

This question makes me think of the theories and personality test of the psychologists. I think I can combine all the theories made by psychologists and find all the similarities between them for the conclusion of human beings' personality.