I also have pretty bad anxiety about this; the first time my friend asked to chat with me on TS I was like "nope".... think it took her about three months to finally convince me?
And the first time I did it in raid I just muted myself. I sorta honestly wanted to mute them too since it's loud , but since I use audio cues a lot, calling out stuff helps me a ton so.... I do find that useful at least

I hate voice chatting. I still do. I know some people prefer it but...ugh no thanks. Just as bad as the phone; I have pretty bad phone anxiety too (this was fun when my friends and I all lived together and none of us wanted to order something over the phone..we'd all fight about it. good times).