I moved this to the strategy / technique advice forum. ^_^
Hmm.. I guess I'm a bit too late since I've already posted a bunch of videos of myself!
I do see your point, but I also don't think there is too much wrong with showing your face if you think you can handle the criticism. Currently there isn't very good face recognition across social media platforms, so as long as you protect your personal information, I think there isn't too much to worry about with showing your face to the Internet. The haters don't know where you live. They're just bored kids behind a keyboard.
A few people I know in real life apparently stumbled across my videos and didn't realize it was me until they brought up that there's a violin girl on YouTube who sort of looks like me lol. xD That made me realize how people still separate "real life" and "internet life."
As far as being teased about looks -- yeah, that happens...for me, it happened in real life too (buck teeth are great fun to have as a kid in public schools lol), so perhaps I was already used to ignoring it. If people aren't picking apart your looks, then they are picking apart the sound of your voice, or the way you swallow/breathe, or the way you phrase the video. There's always something beyond your control that people will nitpick about.
I think showing your face can be both a beneficial and limiting thing to do, depending on the situation and your content. Some videos are perfect for never needing to show your face. Other videos would do better if the audience could see who they are listening to. People like to connect with others, and I think the more realistic and relatable a channel can be to its audience, the better. I think one of the easiest ways to start to be relatable is to show yourself to other people as a regular human with flaws like everyone else. ^^