How do I fix social anxiety?

I really need a solution for this
I shake when I meet people and I get nervous it's embarrassing bc the people talking to me also notice how I shake uncontrollably
My face also looks dead and act rude unconsciously (really unconsciously, I always think I'm acting normal but my sister tells me why does your face look dead when u talk to people) I guess self mechanism
But it's really annoying, I even talk in a rude "get out of my way" type of thing

Someone give me real solutions
How do I fix social anxiety?
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