Feeling Like an Invisible Ghost

So, lately, it's like I'm invisible to everyone. I try to speak up in tutorials, but the TA shuts me down before I can finish. During group work, it's like I'm not even there – they chat amongst themselves, leaving me out. And then there's the time someone asked me about shuttle bus tickets, but before I could help, another person swooped in, and they just carried on chatting like I was a tree. Seriously, why does it feel like nobody wants me around? It's making me feel super lonely and down.