Why has Dill run away from home? What reasons does he give?

From the text:

Refreshed by food, Dill recited this narrative: having been bound in chains and left to die in the basement (there were basements in
Meridian) by his new father, who disliked him, and secretly kept alive on raw field peas by a passing farmer who heard his cries for help (the good man poked a bushel pod by pod through the ventilator), Dill worked himself free by pulling the chains from the wall. Still in wrist manacles, he wandered two miles out of Meridian where he discovered a small animal show and was immediately engaged to wash the camel. He traveled with the show all over Mississippi until his infallible sense of direction told him he was in Abbott County, Alabama, just across the river from Maycomb. He walked the rest of the way.

After this long and involved story, Dill finally admits to stealing train fare out of his mother's purse and hitchhiking from the station.