It is part of you, though. That energetic, confident, outgoing person...is you

Its just that you may get in a habit of not going out and communicating for a while and suddenly become a bit rusty.

Being confident, out-going is not who you are - its a habit that you may or may not fall into. Its not fixed - its fluid.

Really confident, outgoing, happy-go-lucky people are like that because they are out there a lot being confident, outgoing, happy-go-lucky.

If you put them in solitary confinement for 2 weeks I bet they wouldn't be so bubbly when they first come out.

Mate, its just a habit. Habits can be learnt and unlearnt. You just need to get in the habit, that's all.