Can you tell when girls are nervous around you?

If I don't know them, I have noticed they shift their weight back and forth while standing, always avoid eye contact, but still try to spot me out of the corner of their eye. If they have a purse, they get a death grip on the strap with both hands.

If I have met them before, they stand opposite of me and don't make eye contact with anyone unless they are answering a question, generally being quiet. Playing with their hair, maybe putting their hands in their back pockets so they don't fidget.

1) blushes when around you
2) avoids eye contact (when you look her straight in the eye, she looks down or away)
3) shy around you, doesn't talk as much as she usually does
4) Nervous laughs
5) Fidgity
6) awkward smiles

There's of course are more signs, but these are some signs I catch myself doing when I'm around my crushes. Hope that helps!

One of the guys I was with a little while ago said that, before we were together, he could always tell if I felt nervous around him. When I asked him how he said that whenever he made me laugh I had a nervous giggle! He said that other times he could tell because I was always playing with my sleeves or my coat and I would avoid eye contact.