Dear Serpentaura,
I can sympathize with your story, as I was very much an outcast in high school as well - for different reasons, I had very bad acne. In college, the skin cleared, and I started getting a lot of attention from men, but since I was so love starved, having been virtually ignored as a teenager, I started developing obsessions (just as you are with this woman.) I highly recommend you read, Howard Halpern's book, How to Break Your Addiction to a Person. In addition, you can check out, www.tapintoheaven.com - she has acupuncture points you can tap to release obsessions. Last, but not least, try listening to tapes from a company called - www.thinkrightnow.com. They have tapes on losing weight, and I've heard they're very effective, especially if you listen while sleeping.
Best of luck -
rachel