The strange thing is that the one place, besides my living space (which is primarily my bedroom (I have made it way too easy to stay in here. I have a fridge and microwave in here even), is on stage, behind a mic and singing. One last note, when your friend does do something extroverted and silly try not to be too extreme in your response maybe. Not that you have in the past but affirm the behavior without being too demonstrative. I know IF I am silly around people and they laugh too much or hard I can flash back to being mocked, smile a little and enjoy the moment with your friend but try being gentle about it. It's a tactic I use with my shy daughter as well. She wouldn't sing for the longest time because people around her would make a big to do about it and then SHE became the focus instead of the singing and it scared her. So I smile and calmly affirm her and she is singing more for me now, which is great. I can share the gift my father gave me, music, with her.