You need to start doing these things often enough that the anxiety starts to subside. You are anxious because these experiences are new for you, but do them enough and they will become routine.

Remember how you felt before you went to the theater? You weren’t even sure you could do it. But you did, even if it felt weird during or after. That’s ok. That’s real progress. You did the thing even though you were afraid. Now you know you can do it, and it will likely feel less weird next time. Keep building progress slowly, and remember it’s ok to feel anxious.