i used to suffer from really quite debilitating social anxiety: i wasn't able to even try and be myself in social situations because i was so scared and afraid of other people. ultimately what helped me was digging deep into my history and figuring out why i felt so scared of people in the first place. i think emotional regulation tools/skills are obviously useful too, like in this case taking deep breaths, etc
your situation sounds really tough and i feel for you, comrade. hoping you feel better soon