Why do my friend's friends keep staring at me when I'm around them?

I've noticed recently that my friend's friends stare at me. They don't even try to hide it, if they're around me, they'd stare at me. Both his male and female friends do it. Sometimes they would just look at each other when I'm around and stare at me. He's very awkward to talk to me in front of them. His friends are my acquaintances but we're not that close that I can ask them why they're looking at me. And I can't ask him without understanding the possible reasons. Can it be that they dislike me secretly or there's something negative going on? He seems to be a very respectful and kind person so I'm not really sure.

Why do my friend's friends keep staring at me when I'm around them?
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