I have social anxiety, well at least I'm 99% sure. That official 1% is left up to a doctor. I know how you feel, it's awful. I'm in the very early stages of trying to get over it.
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I'll tell you a few things that have helped me, that I recommend you try.
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- Deep breathing, doesn't have to be slow, just really deep breaths whenever you start to feel anxious or even if you're just in a situation which usually makes you anxious. Also, if you have problems with blushing/going red, breathing is amazing for minimizing that as well (the worse thing you can do for blushing is put your face in your hands/sleeve, it will only make your face hotter and make cooling down harder).
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- Mentally/verbally challenging bad thoughts, this might be tricky if your anxiety is severe, but it helps a little bit in mild - moderate situations for me. Once I was very nervous about walking to school, since I don't do that often, there were people everywhere and I was freaking that I'd have to walk past them. So, I told myself out loud 'it's okay, it's just walking, nothing bad is going to happen, just go, you'll be fine' and counting up to 3, which I would then walk out the door on (took a few times).
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- Setting small realistic goals, the type of goal you set for yourself will depend a lot of your situation. Do you need to improve school attendance? Do you want to meet with friends more? Do you need to talk more? etc. For me, my school attendance was awful, so I set a goal to go every Monday, Wednesday, and Friday (because those are my 'easier' days in terms of anxiety provoking situations). Now after 6 weeks after setting this goal, I've only missed one of those days (but I'm yet to go on a Tuesday or Thursday). When you have time off of school/work, it's good to set goals for those as well, such as Have one conversation with someone every day, or Keep to your showering scheduled (both goals I set for myself because I had trouble doing them).
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These things have definitely helped to control my anxiety a little better. I do feel more in control now, and that it turns also seems to lower my anxiety. This is all I have off the top of my head, and I hope it helps you a little bit. Good luck.