Aren’t I the Female Lead?

I transmigrated into a novel. Not as a villain or an extra, but as the female lead. What luck is this! An older brother with a sister complex, and two handsome men as childhood friends. Where else can you find such ‘female lead buff’? …But wait a minute, The original male lead, the Little Duke, likes another woman? And she’s like me, who transmigrated in the novel?! “This is a secret. It’s been a while since I’ve actually liked Little Duke.” “If I say I’m dating Lady Dana, is there a problem with you, Ariel?” Wait, aren’t I the female lead? I can’t do this. I’ll just throw away the original male lead and live happily with the pure sub male lead. The male and female lead roles, take them all!