Why girls look at me while i'm not looking or aware of them? but when I look they act like I don't exist?

sepehril
I am living in turkey , antalya now (it's about 3 months). And i think girls are acting weird here.
For example when me and my friend were on the bus , my friend told me, that girl checked you out like 1000 times , did you noticed her? And everytime i turned to see if she's looking , she act like I'm not there and turned her back to me.
Another time i was with my father seating on a bench near the beach. Two girls came and sat on another bench near us.
I didn't even noticed them. I noticed them when my father told me these two girls are turning their heads and looking at us all the time. Then i checked them from the corner of my eye and see my father is right , they are turning their heads around and look at us (Because they had their backs to us)
But when i turned my head toward them they never look and when i look the other way , they keep turning and looking this way.

My question is , i am confused and feel bad because these girls act like they don't want me to look at them , and they are so professional in checking guys out that i need someone to tell me that they are looking at me. Is it me? Do i have a problem or they are for example are shy or something?
Why girls look at me while i'm not looking or aware of them? but when I look they act like I don't exist?
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