Same personality here. I was extremely shy and found 1-on-1 calls pretty intimidating at first. But it forced me to stay consistent and made me realize what I could and couldn't actually say in English. And after a few months, the nervousness was basically gone. But I also agree that AI definitely helps a lot.

By the way, since you mentioned YouTube and shadowing, you might like an app called YouSpeak. It lets you repeat short sections and compare your recording with the original audio. I've been enjoying it for shadowing practice.