Date Proposal?

On Wednesday, a woman that I've been chatting with online, asked if I was comfortable to have dinner with her. Without thinking much, I said sure, but I regret it now. I guess the major deterring factor is that her looks aren't that good. I don't want to sound shallow here, but I saw her Twitter pictures and I just can't stand her long finger nails and weird smile. I try to tell myself that the reason I'm not seeing her is because I don't want to hurt her feelings by only seeing her once. But who am I trying to fool? I know the main reason is because I don't want to see her, and gag as a result. I know I may sound shallow here, but what human can survive without breathing?