Is there any yaoi manga where the guy thinks the other guy is a girl or something like tha...

http://www.mangago.zone/read-manga/love_stage/
http://www.mangago.zone/read-manga/kuro_ouji_no_iinari_ni_naranai/
In both the mangas, the either of them thought that the other guy was a girl ,in their childhood

http://www.mangago.zone/read-manga/ore_to_kacho_no_shujukankei/ (second couple)

Here are some ^ ^
http://www.mangago.zone/read-manga/hatsukoi_kazuki_rai/
http://www.mangago.zone/read-manga/houtou_musuko_to_koi_no_ana/
http://www.mangago.zone/read-manga/yorimichi_kazuki_rai/