I can understand how you feel. I have a problems with anxiety. I don't have a fear of blushing, but I am extremely afraid of messing up in front of people or making myself look stupid. I'm so introverted and unwilling to do anything because of it. ... It's like I want so badly to do something but I'm literally incapable of doing it.
i think i have some kind of anxiety disorder. i can't speak in front of people even when i want to. and if i want to say something, i have to repeat it in my head a couple of times to make sure it sounds good, and sometimes i still can't get it out.