Yang was born and raised in Taipei, Taiwan, her father was from the Shunde, Foshan, Guangdong, China. She spoke Cantonese at home. By the time she was 13, she had to start working because her father's business failed, which led to her parents being divorced. She attended Hwakang Arts School in Performance Arts. There,she met classmate Alien Huang, and they dated for three years. Their relationship ended when Rainie made her debut in the entertainment industry and dropped out of high school.