h, I feel like I have been writing for hours with no luck.
I know what you mean, Chloe, I hate that!!
google this: compare contrast essay. bookrags.com/articles/5.html
Do not write the intro paragraph first! Write it at the end, after you see the form the essay has taken.
Start by thinking about the truth behind each book, the meaning. Do they conflict with each other? That would be interesting. Are both authors saying the same thing in different ways? Write a paragraph that tells about the main idea of one book, and maybe throw in a quote, and then write a para about the main idea of the other book.
You'll build momentum, and the essay will take form.