I Have Become an Immortal, You Told Me That I Am the Supporting Actor

I am the only god in the immortal world for thousands of years. I am so powerful that at the touch of a finger, the three realms will crawl at my feet. But one day, a voice claiming to be the system told me that I was just the female supporting character Bai Yueguang in the male video book. I will eventually fall in love with the male protagonist, sacrifice my supreme magic power to him, and then fall, just to help him ascend. I was speechless after hearing this. Is he worthy of a woman?