I'm overweight by most standards. I still have acne and break-outs. And that's why I hide behind a computer screen. It's hard to judge someone's looks without pictures and only by their words. I do get it, though. I'm guilty of it myself. Humans are very visual creatures, and we know what we find physically attractive. I know I like a bright smile, neat appearance, and nice eyes. But if the most visually-perfect person in the world to me is going to be some snobby, egotistical jackass, nothing about his looks will be enough to save a relationship. I've been down that road, and I will never do it again.
We have baggage. All of us. I have a huge chip on my shoulder from abuse that I carry around, and it scares people off, I can't deny that. I'm kinda rambling at this point, but I have some trouble articulating my feelings on physical preferences. I guess I can say it this way: don't let preferences be a deciding factor. If you normally like girls who are slim and cute, don't rule out a bigger girl who might be shy and sweet. Or don't rule out a blonde if you normally like brunettes. Be confident, but not arrogant about your own looks.
And now that I'm starting to sound like Polonius in Shakespeare's Hamlet, I'll shut up.