does real life gender ever change a gender of the word? such as instead of mon livre, would i ever say "ma livre" if i was a female? or is it always strictly about the word's gender in all cases?
It's always about the word's gender. The gender of the speaker makes no difference.
Why is Il est mon livre incorrect?
It is about the usage of "c'est"
Whenever "it" is followed by "is" we use "c'est" instead of "il est"
What is the difference between c'est and ce?
Ce is "this." C'est is "this is", "that is", or "it's"
The feminine form of "livre" is "pound"... "C'est ma livre" means "it's my pound"! Taking ownership of one's weight is always a good thing.