Quick Transmigration: Am I Saving Myself?

Although she has never won the lottery, Tian Tian has always thought she was incredibly lucky. That is, until she was bound to a System that can do nothing but transmigrate. Forced to transmigrate into her unlucky self from a parallel timeline, she must defy fate and change her destiny. First world: She transmigrates into the ancient era as the unlucky fifth child, about to be sold by her heartless parents. She flees in the dead of night, carrying a train on her back as she runs, and meets Yang Qingyuan, her life mentor.