mine first romance/fantasy manga was sailor moon, first bl was love stage (or it might’ve been Huahua you long? anywyas hated that) and my first adventure was AOT
if u can’t remember yours than just lost a manga u read awhile back.
The first manga that I ever read was "No Exit" I just found it in a bookstore and bought it when I was 10 or something
The first BL I read on this side was BJ Alex reply