What I am about to tell you is the most terrifying truth about minecraft this also doesn't include multiplayer and not meant to make any minecraft user quit.
[spoiler]You will be alone. You will meet the villagers but you will never understand their language. You will build the greatest things and nobody will know. You will make inventions, traps, ect. But nobody will know. You will fight thousands of millions of billions of monsters and nobody will know. You will go into -Blam!- itself and nobody will know. You will save the world from a horrific beast and NOBODY will know. You will always be wandering... Until the end of time...[/spoiler]
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Excluding multiplayer doesn't count because multiplayer is part of the game, whether you like It or not.