Why does this happen to me?

Okay im in high school and im kinda the quiet shy girl. I have friends that were in big friendgroups and i would be there too but not talk like they know nothing ab me but my close friends broke from these friendgroups. We are kinda the famous trio and the other friendgroups are famous too but im just there i do nothing. These friend groups hate me now for no reason and my friends that did nothing i mean i get it but why me? And they be serious ab it too. And there's another friendgroup w the “cool guys” that feel the need to tease me everytime by shouting my name and waving at me and i dont get it it is kinda annoying cause they dont wave at my friends only at me and im afraid they doing it because they think im an easy target or something. Its so confusing having friendgroups hate u for no reason. One of these comes and gives me his hand and talks to me but behind my back he talks trash. I fr have done nothing i just exists and dont get the fame

Why does this happen to me?
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