I'm having a hard time opening up to this girl?

I met someone just incredible. She really likes me too, she constantly talks to me, alludes that she wants sex from me, is very supportive. She even gives me food at work, and tells me she misses me when I'm not around.

She is everything I want in a woman. She's smart, really ambitious, she's got this cute accent (she's Texan, I'm from Canada), she's very strong willed... Insanely good looking. She's confident and isn't afraid to say what she feels... Which brings me to my next point.

For whatever reason, even though I feel this way, I can't bring myself to open up to her to tell her how I feel. It's like subconsciously I really do think she's out of my league. I'm unstable career wise right now, and I don't want to drag her down. Plus I've been burned too many times to count when I've expressed my emotions towards women. I've had most success when I've kept them hidden and played it cool.

This is just eating at me because I can honestly say I may be in love with this one. This may be an odd question, but how does one work on opening up?