reluctant to go back to office

We are now working from home and have 2 days working in the office. Somehow I feel miserable during those 2 days in the office -I feel uncomfortable to have small talk with colleagues. I often feel those conversations are forced and unnatural and totally unnecessary – they really stress me out.

Is it because I have anxiety and social phobia or is it every one feels the same way but pretends they are okay? What to do if someone keeps asking you how are you and you don’t know how to answer?