Until it’s absolutely certain I see no reason why Mo would need to change unless it’s really affecting him mentally.
If you are a dude sending a message to a cool chic, get it into your head, you are not the only one. ’ or ‘I think I who your favourite actor is,’ work great.
Instead of worrying about it, have fun with your friends, dance like no one’s watching and enjoy some champagne (or whatever your favourite refreshment of choice is! A good night out does something for your confidence.