Looking for a book I read after borrowing it from the library. Features a female protagonist. Born in the future, where the Earth is mostly uninhabitable. Remaining people live in domed cities. Technology has advanced to the point that bodies can be replaced if damaged, aged, or diseased. People can design their own bodies, ranging from normal human, to the fantastic.( wings, multifaceted eyes...). Young people often commit suicide in fantastic displays, just to get a new body. The protagonist, in the end, chooses a rugged human body and ventures out of the domed city. She starts trying to live in the real world and chooses mortality. She kind of starts a cult with others who follow her out into the world.