Best tips to deal with Social Anxiety?

So sorry to hear that you're struggling with this. Public speaking is actually one of the top fears that people have. You're not alone with your fear of speaking in front of everybody. I don't know if it's encouraging or not but in the comic books, Peter Parker aka Spider Man had social anxiety disorder. As far as suggestions go for overcoming your fear I would recommend talking to your family about it. Sometimes families can be really supportive about this sort of thing. You can work on building confidence when speaking by practicing in front of a mirror to make sure that you're not stumbling over the words and that you're remembering to make eye contact. Then when you're comfortable with this you can try practicing your speech/presentation in front of your family. Your family should be supportive and willing to listen and give you friendly advice. You can also practice your speech with a close friend to gain more practice and confidence. Another trick that you can try when having to stand up and present something is to look at the wall in the back of the room right above everyone's heads. By looking at this place on the wall it will look like you're making eye contact but you won't have to be distracted by the expressions on peoples' faces. Make sure that you're wearing comfortable clothes when presenting something too, that way you're not uncomfortable with how you're outfit fits or how you look. I hope this helps a little bit!

I know how hard it can be to deal with social anxiety. Mine is pretty bad and it constantly makes my life more difficult. What I try to do, is remember that what triggers social anxiety in general is advanced fear of something before it actually happens - like switching schools, which is my case. So what we must do, is try to stop negative feelings before they actually begin to threaten us. Try to accept the fact that you don't know what's going to happen - and that the possibility of something bad happening is much smaller than the possibility of things running smoothly. And when you feel like people are staring at you and making comments about you - try to really focus on them and in your surroundings, instead of focusing solely on yourself. It makes you realize than people are usually too worried about their own lives to pay attention to you.
If you need to ask a question to your teacher during class, you can try to focus only on him or her. Pay attention to their words, not you your fellow classmates - that are probably going to be too busy gossiping to pay attention to your question anyways. Or you can simply make a subtle sign to your teacher to call him or her over, so you have more privacy and will feel more comfortable.
And less but not least, you can always talk to a therapist so they can help you to work with your issues and have a little more self-confidence. It's going to be just fine, I promise.
If you need to talk to someone, I'm always here for you :)