Why do some girls in my school keep looking at me?

Anonymous
In my school there is 3 girls that stare at me kind of a lot
The first in girl in my class sometimes I talk to her but not so much I noticed her sometime looking at me and a few months ago she asked me for a pen and I gave her a pen then I forgot about it until few days later when she asked me if I wanted my pen back
And this happen again last week when she asked me for a marker pen and I gave her one and she didn't return it (I'm too shy to ask tbh)

The 2nd girl is also in my class my friend tells me she keeps staring at me a lot I don't to her much so I don't know whats up with her and she's kind of weird

And the last girl is some girl from other classes and I never talked to her but I have noticed nearly every time I walk near her she starts looking at me then looking away then looking at me again

So my question is: why are they looking at me? Maybe there is a rumor about me?
Why do some girls in my school keep looking at me?
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