Can't really help you here, buddy. I've been on the same boat all my life. I'm always unsure of female motives, and find out that females were in fact hitting on me a year or two later (when it is obviously too late). The best solution I find here is the "Shotgun/Spray & Pray Method" where you talk to everyone until you eventually find someone who likes you. If it's 1 person out of 100, it's still one more than if you didn't try at all. Then there is the "Relentless Assault Method" where you don't hold back and she either reciprocates, or tells you to get lost. It has a rather all-or-nothing approach, but it does free one of tortuous uncertainty. This has a rather low success rate, but is definitely higher than the "Watch and Shoot Method" that I've been using for years, where you just camp-out and wait for the perfect opportunity for the perfect shot which will deliver the "kill". Tends to waste your years away, and before you know it you're an old man who never got his shot.
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Valar Morghulis