I was very avoidant when I was a teenager, I avoided everything. I remember I never replied to phone calls, when there were people in my house I was always hiding from them, even family friends or relatives.
Now I feel I'm less avoidant. I have a bit of avoidance with the phone, because if there is a phone call, I don't want to reply. The problem with avoiding things is that your anxiety remains the same, or it could be even higher than before. By avoiding things you dont face your fears, and challenge your thoughts. Try to make a list of things that scare you, try to think if there are situations that seems less scary (maybe going out, take a walk, buy groceries...). Exposure worked for me, I tried to do things that gave me less anxiety (like make simple phone calls, or go shopping etc...) and my anxiety decreased a bit.