Undertone/Foundation Shade Help Please!

Hi everyone! This is my first time posting on this subreddit, and I'm so happy I found it! For years now I've been trying to find a foundation shade to match my skin tone, and everything I've tried just looks bad. People always make jokes saying how I'm secretly a vampire considering how pale I am, and I've even had a kid look at me from across the street and exclaim "Mom, look! That girl is so pale!". People here probably know the struggle, haha. Anyways, here are some of the foundations I've tried:

• NARS Sheer Glow - Siberia (way too yellow for me)

• Urban Decay Naked Skin - 0.5 (too dark and orange, swatching it on myself makes it look like I have a bruise)

• Bobbi Brown Skin Foundation Stick - Alabaster (too yellow)

• bareMinerals Original Foundation - Fair (too dark and orangey)

• MAC Pro Longwear Foundation - NC15 (too dark and orangey)

Along with these I've also swatched pretty much the lightest shade of every foundation in my local Sephora and I have yet to find something that even comes close. I'm hoping that someone here can help point me to a good foundation shade that they think could work for me, or at least help me figure out my undertones. Here's a picture of me in natural lighting:

http://imgur.com/alIgrNl

(Sorry the image is potato quality! I took it on my phone so the quality is kinda terrible.)