... It is. He's saying he doesn't feel like much of a person sometimes, like the main reason anyone wants him around is because he fucks good and beats things up for them.
That's some depressing shit to deal with. Sex doesn't immediately make all things tolerable.
Let's also not mention he's the only one doing any work during these escapades, the others are just lying there and taking in all the benefit.
nothing less expected from this degen series. At least this series stands to be completed in manga form, we don't have much isekai up to this point like that. Sayonara~