OP: You can't determine your worth by what other people think of you. Their opinion really doesnt matter.
What you might not realize - and I repeat this a lot - is that, even if these girls found you attractive - they'd still treat you like ****. You may think its a curse to be rejected by these *****es, but its really a blessing. I'll compare your side to mine to explain.
In my case, these *****es accepted me. I was attractive enough. I thought I was a special cookie, because they were nice and flirty with me, but rejected other guys in a very cruel manner, and generally treated them like ****. Just as you describe. However, once the infatuation wore off, and they became comfortable - it was absolute hell. The ***** that was hiding came out in full force, and everything was directed towards me - being that I was involved with them. Since they were controlling and manipulative (on top of rude and disrespectful) - they tried keeping me around, despite being complete *****es.
So really, finding out that they're a ***** and getting rejected in a very cruel manner early on is much better than being fooled by fake niceness - only to be torn apart later. You might not realize it 'cause all you see is the pain of rejection. But, these girls are bullies and *****es, regardless of who they associate with. You aren't special because you're "ugly" - because it has nothing to do with you. They're mean, critical, snobby, *****y with everyone. They just make you seem like the problem, and the reason they are rejecting you. They also only act nice when they're trying to gain someone's favor, or be accepted. This is how jerks are. These girls you mention are jerks. That's the problem, here.
Nice people are nice to everyone - regardless of if they're interested in others or not. That's a big thing to look for. Once you get away from the *****es, you don't feel so bad. Even if you get rejected - its not done in such a rude, insulting, disrespectful manner. It's no big deal, cause they were nice about it. Same goes for whatever relationship you have with them. They don't string you along, use you, and all that crap.
Once you move your mindset away from the *****es, and realize they're garbage - you're much better off. Unfortunately, a lot of very attractive women are *****es - because they can be. Just the way it is. Maybe you should chase after the DADs. :rock: