Why can't I use enter in my about me?

Hi! My name is Vin. I'm not a really socially active person, but here in aff I want to try making friends :) I'm an avid kpop listener and a slight otaku, esp for detective,and themed manga/anime/otome game (a little bit) and I also like Kamiki Ryunosuke (j-actor) very much. My ultimate kpop biases: Kim Sunggyu (INFINITE), Jung Daehyun (B.A.P), Yang Yoseob (BEAST) (I'm a er for vocalists....), Choi Sooyoung and Kim Hyoyeon (SNSD) (cause they're awesome and hilarious) My anime/manga biases: Edogawa Conan/Kudo Shinichi (Detective Conan), Sumimura Yoshimori (Kekkaishi), and many male protagonists Kpop groups that I listen to: too many to list....