So while most people would say someone who doesn't dare to talk is shy, it is totally possible to still be shy and be the life of the party.
As an introvert who has zero stage fright and good talking skills: I am still an introvert. Being around people costs me energy, while for extroverts not being around people costs them energy. I would not be perceived as an introvert by most.
I have a lot of resistance to go and meet people, break ice, try and engage in conversations even with people I know very well or supposed to work with on a regular basis. I feel drained afterwards and need a break after every meeting. The meeting itself usually goes well, and I am fairly engaged even if not the most talkative -- if the subject matter of discussion is my work or something I am reasonably interested in I might be the most vocal even -- and people who meet me (without knowing me and my preferences closely) might very well picture me as a "normal" or even an extroverted person.
But (I just came up with this thougt experiment:) if someone were to interrupt my social or professional meetings at any random point and give me a choice of either continuing or immediately going back to "me time" without any consequences -- I think I would choose the latter 90% or more of the time.