Girl looks at me when I come to class?

[gimbap]

So, I'm in 9th grade and im asian. I don't consider myself to be ugly but I am a bit overweight. You could see some of it in my face, but I dress well so other parts aren't noticed that much. Even though however, my stomach is not that big either. Now, heres the question:
2nd period, I walk to my class. Usually the girl is talking to her friend with her back turned, but when her friend notices me, the girl turns around and looks directly at me. It happens a few times in class also, but it's just a plain "look" or "glance". I don't think shes trying to say something, but I feel like at the same time she is because it happens so frequently.
Another girl also at lunch sometimes stares at me when she sees that I'm alone or just not talking to my friends.

I don't consider myself popular, but the two girls are. I just don't feel the confidence due to my body and honestly, there's no way someone could encourage or even force me to start a conversation with the first girl. The other girl however, does sometimes start small conversations with me. However, she does this with a lot of guys. I know I may sound "stalkerish" but i could tell when she ACTUALLY likes someone and when she just likes him because of his facebook profile pictures. I would consider myself to be in the "actually likes" category due to her constant glances. It almost seems as if shes trying to "read me".

I honestly don't know what to do.