See the link below, where this same question was answered yesterday.
Huck Finn dislikes civilization so much because it is so confining and, in his mind, worries about things of no importance. In chapter one, the Widow Douglas takes him in. Right away, Huck's life changes when she starts educating him. The Widow Douglas begins reading the Bible to him, and Huck is enjoying the story of Moses...until...he finds out that Moses is dead and has been dead a long time. This ruins the story for him because Huck sees little purpose in hearing about a dead guy. Huck is a common sense, black and white kind of boy. If it doesn't make clear sense, he sees little point in thinking about or doing something.
Huck also detests rules, and at the Widow Douglas there are many rules. Huck has to eat dinner at a specific time, has to say grace before eating, is not allowed to smoke, and must learn spelling. This is completely different from the wilder life he led earlier. Prior to the Wido Douglas, Huck ate whenever and did whatever whenever he wanted to. He even chooses to sleep outside often before it get cold.
Clear Huck feels trapped and wants to be as free as he was at the beginning of the book.