I completely understand, if that helps. I speak to a friend in Scotland every Sunday evening, but if my husband is around I can't have a natural conversation, even though most of what we talk about is fairly banal - 'have you decorated the bathroom yet?' sort of thing.
It's not that I have secrets from my husband, or that I confide anything particularly personal in my friend, but I can't relax if he's there, for reasons I can't really explain.
Similarly,I have weeks Zoom meetings to discuss poetry, which is an interest of mine (we used to meet in a discussion group, but clearly that doesn't happen just now), and I feel the same about those. My husband isn't interested, and wouldn't even listen in, but just having him in the room is, as you say, inhibiting.
Luckily, my husband understands and takes himself off when it's time for the call or the meeting.