Is it normal for girls/women to do this?

Yeah, totally not just in your mind...

They're actually body-snatching aliens.

It sounds like you're reading a little too much into it. I'm sure a lot of it isn't deliberate. Not all women do that kind of thing, but if they think you're attractive or want to boost their ego with your reaction, many will um utilize their assets.

They're telling you to get over yourself and stop reading so much into things.

This made me think of a few instances that I was talking casually with guy friends and looked down to notice I had one finger tucked inside of my other hand that sort of formed a circle...and other times when I had my phone sitting very near to my crotch, haha. I felt embarrassed and quickly readjusted, hoping no one noticed. A crush may have been present when this hardened...

It also makes me think of a time I was grocery shopping with a female friend who had spotted a guy she found attractive and poked her ass out as she bent over to pick out some meat and started talking a little louder (she was also unaware that she had a tiny hole in her pants:O lol). She was clearly trying to get the feller to "holler" at her.

Sometimes women do these things subconsciously and they're not trying to tell you anything (despite what their bodies say), sometimes they're blatantly trying to attract a mate.

It may be true some of the time, but there's no way to tell for sure. So, it's really not worth putting much thought into.

Maybe yes, but probably no. Try not to read too much into other people or at very least don't react to what you perceive as these messages cause you could get yourself into trouble. Whatever you do don't put your hands on someone else or sexually harass anyone. Not everything is about or geared to you, try not to flatter yourself too much.

I don't pay a lot of attention to non verbal communication unless I find it to be threatening or making me uncomfortable. I try not to act on other people's non verbal cues as some sort of invitation, and certainly don't see it as an acceptable substitute for verbal communication and consent.

It's normal all right, sad to, women have been brain washed to do that shit. A LOT of women see themselves mainly in terms of how they relate to men. I've seen women wearing makeup at the damned beach. The guys are surfing, swimming, biking etc and all these girls are just standing there being "pretty" for the guys. It's like their whole existence or something. This crap ruins these girls lives, their just standing around like manikins in a store window. Sad shit.

Perhaps this song can educate you on the matter:

https://www.youtube.com/watch?v=h41oYYO8CGY

Yeah, you're totally right OP you should start following these women, track their movements, then, when you know their going to be alone, real romantic like, you can sweep dem off der feet, and take them out to the cabin in the woods...