Word... it's not as glorious as it sounds once you land these hot girls. And it works both ways, 'cause they do the SAME thing with men. They also have the same mentality as you. This is why it's so hard to keep them - and you. Never forget that like attracts like. They're just as independent, "high class", high maintenance, difficult, shallow, etc. That's why a lot of "hot" people don't shack up together, or last long with each other, and can't stand each other. Just because they're attracted to you doesn't change who they are.
I doubt there's anything you're doing "wrong" - it's just the way they are, who they attract, and are attracted to. This you REALLY need to realize, or you'll be "improving" yourself forever - only to run into the same problems. Because, it's only this type who makes you think this way, and makes things so difficult. Don't think there's something you're doing wrong, and thereby pedestalizing these high class bishes. They only think they're special, and make you think that way, as well. They're no prize to be won. There isn't a secret ingredient to keeping them. Hell, most of them don't even want to be caught - and aren't worth a **** when they are. Definitely eliminate the chase / prize mindset you have going on.
It also sounds like you're looking for someone perfect, which doesn't exist. Learned that one the hard way, too. As well, just because you CAN - doesn't mean you SHOULD. I don't know if lowering your standards is necessarily settling, though... especially once you deal with enough of this ****. ****, I'm at the point where I can't STAND the kind of girls you're going after. Girls I talked to also said they were done with pretty boys, bad boys, players, etc. There's just nothing there with 'em. (Not that these girls were any better; see above).
But this goes to show that guys do the same thing with bad girls, sluts, hotties, etc - then settle with decent ones later (while still banging hot sluts). It's all the same, though it's not planned out this way - contrary to what a lot of men think.
You're still young, so all of this is pretty normal. ****, I did the same thing.