Why do women stare at other women?

I noticed that I see lots of woman staring at me, checking me out, and sometimes to the point where they watch me and I look their way and they turn quickly away, sometimes they don’t look away and have a mean look on their face and one girl even gave me the most hateful stare like she was very mad and looked possessed cause her eyes were so full of hatred. These are just the different stares I receive from other women who are probably older than me! I m 19 years old and I don’t understand why women stare at other women especially to the point where I can see them staring, I feel it’s quite rude! Someone please explain why they do this and how I should react?

Why do women stare at other women?
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