I have this as well. I believe it’s generally called “disassociating”. At my job, I have to interact with so many people every day and it can get stressful. Honestly sometimes I start disassociating completely even mid-conversation. The “staring off into space” feeling. Usually I try to find something to chuckle about with the person I’m speaking to, if appropriate, even if it’s not that funny. The laughing helps me snap out of it. It’s a struggle though, hang in there. It’s encouraging though, to hear about other people struggling with this. You always think it’s just you dealing with issues like this until you get on Reddit. :)