If your anxiety is that serious then I would strongly urge you to seek some professional help with it.
I was the shyest person you could possibly meet when I was in my teens, seriously: I could not dial the phone to a stranger and even tried to avoid going into shops on my own. In my first job I worked in a small office as the only male in a small office of late career ladies. I was on the phone dozens of times a day speaking to all kinds of people as part of my job. I then gained a position where I was driving from place to place doing a lot of cold calling and consultative work with existing customers who were all new to me. After a while, you live with it and the anxiety goes away.
I can distinctly remember how I would literally sweat, (I could feel the drips out of my armpits) when talking on the phone to people or when I was meeting people for the first time. It becomes habit and you adapt.
If it is your genuine dream to become a teacher then you will find a way to overcome any barrier.