The way I see the Mane Six in general, they represent the different types of people we meet everyday, as well as how we lived our lives.
For example:
For my life up to after high-school, I was a bit like Fluttershy; friendly, a bit shy, quiet. But I suppose after I got my own place in Oshkosh, Wisconsin and got a job, I became a bit more like Applejack; hard working, more sociable.