You know, I bet there are a lot of people reading this and thinking "how can these people post on this forum and have SA?! I can never reply to a thread, let alone make one myself!" It really comes at different degrees for different people, everyone with their own comfort zones and what they can and cannot do.
Well, I should change that, we
can do anything some things are just too much sometimes. I could go around talking excessively to everyone I see it would just be very, very, very difficult for me.
As far as school is concerned, you would be surprised how little you need to talk during it, if you pick the right classes you could go the whole day in silence.
My first job I got without an interview, and it was one that required very little talking. I just showed up, washed the dishes, and left. No communication required, a dream come true at the time :

:
I have been to interviews since then, I really need a job and money so that takes priority over my anxiety. My mindset is once I get to the interview I cannot back-out or run away, so I must speak. And I am not mute and understand language, so I am able to I know. And the more I do the easier they get. That unknown is what usually makes things hard for me to do, there are a lot of things in life I still haven't gain enough comfort with to do easily because I do not know exactly how to do them, or what is proper. Best skill I could use to learn is probably what to do when I don't know what to do, what to say when I don't know what to say. Then all my bases would be covered.