Yes, they do say that personality is set early in life...some are saying one is born with a certain personality. I know my two children had totally different personalities from the time they were young, and many of those traits are still with them. They have changed in the way they express those traits, however, as they mature. Hasn't your mother or another relative said, "You still have that sense of humor", or "You've always been shy", or something similar?
They've found that shyness is inherited, and shy people are usually hypersensitive. This is a part of their personalities. I can attest to that...I, and my youngest daughter were shy from whenever it is possible to detect. I have found that as you grow older, it (the shyness) has lessened, or perhaps I have just learned coping strategies. I'm not sure, but I'm leaning toward the latter.
They are learning more and more about the human brain every day...we really know very little. If shyness is genetic, wouldn't other personality traits be also? Then environmental and other factors could come into play in how these traits are expressed, often changing as we grow and mature. Make any sense?
P.S. Thank-you, Brad, for making me feel more welcome. I sincerely appreciate it.
the poet's pen...gives to airy nothing
A local habitation and a name ~ Shakespeare