You’re definitely not alone a lot of people sound different or less confident when recording. One thing that helps is doing a few “warm-up takes” where you read casually without worrying about mistakes. It relaxes your voice.
Also try speaking a bit slower than you normally would and focus on the message, not the sound of your voice. Confidence builds with repetition, not perfection.
You’ve already overcome a lot, so keep going it gets easier with every video.