Is it wrong that I have a crush on my roommate?
Why do you have a crush on her?
She's like an angel to me, but I know what will happen if I'm with her
I understand why you feel this way, as this kind of stuff often happens when two people spend a lot of time with each other.  Don't just assume it will end poorly!  Have some confidence in yourself!
It's an interesting thought. I don't have the confidence to face this.
You need to get more confidence if you want to ever have a girlfriend. Letting her know that you like her would be a very good first step to maybe having the love of your life.