Don't Think That I'll Always Be A Cute Girl! is a Manga/Manhwa/Manhua in english language, GENDERSWAP series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

I intended to become the world's strongest "man", but I ended up becoming the world's strongest "woman"...?! The adventurer, Lydel, wanted the sacred stone, "Baetyl's Eye", to make him the strongest "man" in the world. The result? Lydel became strongest, but turned into a girl at the same time. In order for her to return to being a male, Lydel embarks on an adventure to find a new sacred stone, but...?