Reincarnation?

I’m usually a very happy go lucky guy! And I carry this with me to my workplace too! My workplace is a thriving one- slightly tilted towards adults in their mid/late 20s to early 30s. So, its fast paced. With me, it was always one way- cheerful, cordial & meeting everyone with a smile. One instance changed everything. And then, I started being aloof at my work place. I was kind off, taken aback with the office gossips, by the people who had been so good to me all this while. Closing a decade in this corporate illusion, I should have been careful. But the change brought about within, where I am now a reserved person, minding my work, not my chirpy self , had actually calmed me down- put to rest (or atleast they don’t come to me), the conspiracy theories that floated all this while. The self-imposed restraint seems to be more fulfilling than the actual happy-go-lucky attitude.

Do we all live our lives with such dual personalities only to see it become inherent?