I watch many movies these days, and I often feel happy when the main character gets what they want in the end or sad otherwise. Is there an adjective to describe this? It appears to me that vicarious is not the right word because it applies only to people watching other people in real life, but I might be wrong. For example,
I am so _____. I always feel good when the protagonist wins and bad when he loses.
Phrases and other parts of speech are also welcome.