Are us Gemenis really multi personalities?

I do think so.
I know that there is a very shy Barbara and at
other times this not believable.
There is a very organised Barbara but sometimes she is caotic.
What about you or your partner do they have similar differences.
Going to meet 2 MORE Geminis for lunch and we may compare notes.

So a gemini makes a good actor

Absolutely - my mum's a gemini and she can be chalk & cheese within a 5 minute period. Especially when she was a little younger, appearances could be very deceptive - whatever the demeanour on the outside belied what was going on internally.