What Does It Mean That I, an Outsider, Am the Hidden Protagonist?

Another WorldSword and MagicMultiple HeroinesRelaxing and Happy I was reincarnated. I was reincarnated into a Western fantasy game I played before. Unfortunately, he became a character who only lived in the background of the plot, Wayne, the blood relative of the villain Duke. So I worked a little harder, avoided the bad ending, and was ready to start enjoying a new life in another world. But why did this situation start to go a little wrong? Why did everyone come to me? Did I, an outsider, have so many plots? "Why can't I be your maid, mother and wife all at the same time." Could this really happen in reality? "You are my god, the god I believe in and love deeply." Could it be that I am going to become a god? "I don't have to do it with you... I just don't have to do it with you!" I thought you were playing tricks on me, but it turned out you weren't playing tricks on me. Isn't this playing tricks on me? "Obviously, as long as I'm by your side, brother will be fine." If an accident happens to me, can I still see the sun tomorrow? "At this moment, I finally understand that I undoubtedly love you." What do you understand! It's okay, okay, it's not a big problem, my life in another world is still flourishing. What does it mean that the world is going to be destroyed? And I am the hope to save the world. Shouldn't I just be a character in the background of the plot? Aren't we in for a light-hearted drama? Okay, okay, it's okay now. (It's too late to write, I can't put down the detailed introduction, I have something to say in the first chapter)