Why do girls act very strange around me? Blushing, avoiding eye contact etc?

Why is it that 99% of females act very strange around me? They act very nervous, look down when they see me, avoid eye contact, blushing, playing with hair/clothes, voices become higher pitched, and some even tend to stutter around me, or even stumble when walking. Majority of the girls that have had crushes on me act like this, but even females who I don't know that well like work acquaintances act like this. I feel like it is restricting my social life a big deal.

I don't want to seem vain but a few of my friends have said that I am good looking (behind my back, not to me personally). This is just bothering me because the girl I think has a crush on me acts very strangely (like the behaviour I mentioned in first paragraph) and I like her back, but she just can't seem to talk to me because she is too nervous. Can anyone tell me why girls/women act like this around me? Because I like being nice to people and friendly but people just don't seem to talk to me.
Guys also act very hostile/jealous towards me sometimes as well.
Why do girls act very strange around me? Blushing, avoiding eye contact etc?
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