Why does no one talk to me at school?

I never get approached in school. An entire class talks to each other, except with me. I do not know what's happening between me and people, but this is making me so uncomfortable and sad because everyone else around me has friends. Every time when I team up with students, they don't talk to me at all and ignore me most of the time when I say something. They just look at me, and agree with their heads. But I don't know. They just stare and never say anything which makes me so uncomfortable and sad because they seem to get along with each other. I am scared to talk to them. I was bullied in middle school for being the quiet student. But now when I try talking to students, they just don't say anything interesting or just stare at me.

Why does no one talk to me at school?
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