This sounds like me as a child. Selective mutism. Couldn't speak or stand up for myself.

Have you looked at your diet carefully? I believe the wrong diet deprives the body of nutrients leading to anxiety conditions. My problems subsided as my diet improved by removing anything chemical and processed and not natural. Even if it doesn't work you'll be healthier this way. Also try adding things like vitamins, fish oil, etc. It's cheaper than psychologists and meds. But if you do go with meds try buspirone hcl (Buspar). It really worked well for me for awhile.

There is light at the end of the tunnel, you just have to keep trying new things until you find the solution. YOu will get there!