In what ways can I lessen my anxiety?

This is my second time here.

The last time I asked a question here was last year.
At that time, I had not yet told my condition to anyone.
But now, my mom already knows about it. The problem is she doesn’t seem to understand that my anxiousness is really troublesome for me. I think that going to a psychologist or psychiatrist is not one of her options.

I’m experiencing social anxiety and I really want to get better. I can’t interact well with other people especially when there are other people around. Because I feel like they’re looking at me. And I hate it. In other places, the thought of sitting or standing in front where everybody can see me really makes me feel a lot of nervous. That’s what I’m really afraid of. I am afraid of seeing other people’s faces. Although I know that they are not looking at me, I can’t still get rid of my nervousness. The expression in my face is really bothersome because I look like I’m going to cry or something. It’s one week before the class in my school starts again and I don’t want to go to school carrying that kind of expression in my face. So please. Can anybody help me?