Help Help please!!

http://www.mangago.zone/read-manga/oresama_teacher/ (past delinquent tries to be someone else)

http://www.mangago.zone/read-manga/otokomae_beads_club/ (girl that normally acts like a cool boy, tries to act like a girl)

http://www.mangago.zone/read-manga/yacchimaina/ (boyfriend hides a secret from GF, surprise near the end ^^)

http://www.mangago.zone/read-manga/aruitou/ (don't know if this count, the girl acts cheerful to hide her sorrow)

http://www.mangago.zone/read-manga/nobara_no_hanayome/ (hides persona in school, plus when he sees blood ^^)

http://www.mangago.zone/read-manga/adabana/ (wandering swords man what's he hiding)

http://www.mangago.zone/read-manga/ayashi_no_ceres/ (basically characters persona in another character for the twins, they don't try to hide it they just more or less come out)

http://www.mangago.zone/read-manga/gakkou_hotel/ (people can show the 'true self' at this hotel)

http://www.mangago.zone/read-manga/giniro_no_kami_no_arisa/ (might not be exactly what u r looking 4 but friends betrayal killing the MC and the revenge {hide her identity to get revenge})

http://www.mangago.zone/read-manga/hana_kimi/ (girl pretends to be a boy in a All boy HighSchool)

http://www.mangago.zone/read-manga/yoru_made_matenai/ (little bro pretends to be an innocent little bro, but is really a pervert in love with his sister)

hope this helps

Kanojo ni Naru Hi Another
Obaka-chan Koigatariki (I'm not sure about the title lol)

Do you want a switching body manga in specific or that that correlate with your previous preference? If not,
Shishunki Bitter Change

Thank you for recommendation! i really appreciate it!