How would one go about finding one of these girls?
Hypothetically.
As far as I see it, you've got a couple of choices:
Download Tinder, swipe a ton, buy a bunch of dinners, cross your fingers.
OR
Go outside, meet new people, go to social events, go to clubs, take up a class in something you've always wanted to do but never really tried, expand your social circle, open up to a stranger.
First one is completely fine if all you're looking for is an easy fuck. You're bound to get lucky one of those times.
But if you're searching for an actual connection there's no concrete answer except for "Throw yourself out there". It will be embarrassing, you will get rejected, it will hurt. But you will grow as a person and sooner or later the rejections won't hurt anymore. And thanks to that you will grow more confident, so that when you meet the right person you will be able to relax and just be yourself. And that's honestly all that matters.