I Screwed the Novel’s Plot

WARN:
SLIGHT ROMANCE! NO HAREM! FAMILY GENRE!
Filled with political intrigue, warfare, adventure, friendship, and betrayal.
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Synopsis:
I transmigrated into a novel that I read years ago as the second Prince of the Chrono Empire and was fated to be killed by my half-brother, the First Prince at the age of 12.
So, What’s my role in this novel?
Am I the villain?
Am I an insignificant extra?
Am I the protagonist? Nah, definitely not.
But, why bother?
Following the novel’s plot isn’t my style and I won’t let it dictates my life.
Regardless of my role, I am the main character of my own life.