If you have in your head an image of what your dream girl looks and acts like, kill her. Not in real life, but your mental image of her.
Appreciate people for who they are.
If you're constantly measuring people up to some imaginary ideal, they'll always fall short.
Instead, take the time to see how they get along with you and you with them. See if they turn you on. See if they make you laugh. See if you can accept and live with their shortcomings, if the price of the very real bad times with them is worth all the very real good times with them.
Kill the fantasy. Go after the real thing.