Bruh.
Another world: incredibly good reputation as a hero, can marry a beautiful and kind princess who also likes him, can inherit the throne to the kingdom he was summoned to, a living legend, recognized as the strongest(probably) and many more.
Real world: parents died as soon as he came back, relatives are all just a bunch of shitheads, childhood friend is someone who can easily leave him if it's for her boyfriend, no one believes him, was labeled as a failure, was laughed at by the lowest of the low folks in high school and the teacher is someone who shouldn't have been a teacher.