Get over yourself. Beauty is in the eye of the beholder- indisputable. So is love. Realize your love has nothing to do with them, so stop relating it to them, and thinking there should be some corresponding image looking back at you from their soul, their eyes.
Okay that's easier to say than do, so here's some practical ways-
1. Write heaps of soppy wretched unrequited love poems and songs. Not only in a book, but with a marker on toilet walls, etc.
2. Put a message in a bottle for them, telling them of your pain and love, and your undying devotion; release it to the ocean, with a contact address.
3. Drink alot more than you would normally.
4. Be crude, and flirtatious with anyone you can.
5. Cut all your hair off.
6. Get them out of your life. Spit in their cup of tea, or some other secretive form of expression of your anger.