Oh the girls of Omegle are incredibly shallow but look at it this way: there are tons of guys and a few girls in comparison. They have the ability to choose from a wide pool, you do not. Even a homely/fat girl will get attention on that site.
I don't really actively go on there, but in the time I've been going I've capped several dozen girls(screencaps for short flashes, as well as some vids of varying lengths) over the course of a couple years.
Get in shape and your dick size won't matter so much anymore. If you're good looking and skinny-ish it should be fairly easy. Best of luck to you.