Do you really want to be a science teacher? Then you could find ways to do it. But it sounds like you don’t, and of course there’s no reason to push through what would be a lot of genuine difficulties. My husband stutters severely, and he always did research assistantships rather than teaching assistantships while he was in grad school. His advisor tried to encourage him to try teaching, and he’d tell her he couldn’t, and she’d tell him that, no, he didn’t want to do it. If he wanted to, he could. And I do think that’s true. It would have been really hard for him and he’d have had to have been creative about how to handle things, but if it was actually something he wanted to do, he could have done it. I think it’s totally fine to choose work within your comfort zone. My husband has a job where he doesn’t need to do public speaking or talk on the phone or have to talk much to people outside his lab. He likes it, and he’s good at it, and that’s awesome. But if somebody really wants a job outside their comfort zone, in nearly all cases they can find a way to do it.