Alternate realities are a funny thing. The "human world", as top pony scientist Twilight Sparkle coined it, is certainly one of the funniest. A culture obsessed with technology and appearances more than the values of friendship. It's probably why she rarely visits the place now.
However, this is not the story of a purple alicorn princess trying to fit in with a different species, this is about two occupants of this universe, while in Equestria haven't even met, in Canterlot City, they are roommates and good friends. This is the story of a Canterlot High dropout and a stoner living together.