My partner is like this. Fully functional until they went down with stress because of the effort it takes to appear normal.

It took several years to come out of, and to figure out that there is an autism diagnosis behind it

The god thing is, that living in a socialistic country, with proper social welfare she was offered to work 10 hours a week and the state would compensate for the remainder of her wage to equal a full time employment

You're only normal until things start falling apart. I think it's important to not try too hard to be what you aren't