My personality bends a bit.
I am normally extroverted, but when with newer people I become ambiverted.
Most of the time I'm very bubble, outgoing. Add more people that I am close to, and my loudness will only increase.
Start adding people I do not know well and I will start weighing the things in my head before I say them.
Put me in a room of strangers and I will become an introvert, or at least a keen listener.
I think this is because the people I am close to understand me and my way of usually perverse, or startling speech. If I do not know someone well I try my best to not put them in a state of shock. Frankly, I try to be polite in front of strangers.