Girls, Why did this girl give me a weird look?

Anonymous
I was going to class and I realized that I was 20 minutes early so I decided to take a seat on the window sill which is outside my class. I figured I might as well check my phone before I go to class. There were 2 girls near where I sat, the first was kinda cute but she was texting the second was average looking. The average looking girl gave me this disapproving look like I did something wrong.

This is the second time I have received such a look. The first time, I was at the mall and needed to check a receipt so I sat down and took it out of my pocket. Across from me was sitting a cute girl and she gave me the look before I took out the receipt.

Is that the girls look for "Don't flirt with me"?
I have trouble as it is talking to girls due to my lack of confidence, do I also have to put up with this now?
Girls, Why did this girl give me a weird look?
3 Opinion