Easy there brah... that was me like 3-4 years ago. Don't forget we listen to a lot of Phish and wear newbies and high crown visors
Oh okay so basically it's something you will never have as long as you use phrases like "social proof". Got it
Seriously though man it's totally obvious that you're using the fact that you didn't rush as a crutch here. Obviously I think Greek life is a pretty great time but there are plenty of other ways to have fun, meet girls, and enjoy your life in college. I had plenty of buddies in college that weren't Greek but didn't waste their time obsessing about it and they probably had almost as much fun as I did in school. Stop over-thinking this stuff.
The best piece of advice I can possibly give when it comes to girls is, stop worrying so much about it. The more you try, the more you plan things out and think about it, the more awkward you'll be and the more each failure will sting. Now I'm not saying act like a jerk to girls or anything but just don't make meeting women the purpose of your night. When I go out, I just focus on having a good time with my friends and let whatever happens, happen. Just go with the flow. Trust me, I'm sure the ladies will certify that a fun guy having a great time is a lot more attractive than some nerd stumbling through a lame pick-up line or mapping out his approach route between the bathroom and the bar (or for that matter sulking in the corner because he doesn't have letters). Just my two cents.