Unless you want to enter a beauty contest for the rest of your life, if you think looks are everything then you're lacking something in your life, especially if you judge other people based on their looks alone.
IMHO, no, looks are definitely not everything. I'm not pretty, and when I have my bad days, I look like an ogre
and yet my boyfriend never fails to tell me that I'm beautiful, and that he is in love with my personality first and the way I look is a bonus. And yet the way he looks is all he seems to think about, he's slim build and yet he's constantly counting calories, beating himself up about it if he goes over his "allowance" and always so worried. So it seems that to him, looks aren't everything in a potential mate - but they may be everything in himself.
To be honest, I wouldn't want to enter into a relationship with anyone who based it just on my looks, not on my personality. I was friends with my boyfriend for two years before we got together, we met through a common interest and knew so much about each other by the time we got together, we're like best friends as well as boyfriend and girlfriend, not because of looks but because of personality.