I think I have a crush on my boss and that makes me a terrible person
How does that make you a terrible person?
I always want to impress her in every way possible
You can't really help who you like. It definitely doesn't make you a terrible person regardless.
The fact that I like her means that I have a crush on her.
Crushes can happen to you when you least expect it. As long as you don't act on an inappropriate work related crush you shouldn't feel bad!