"New research shows that in most cases the personalities displayed very early in life— as young as preschool — will stay with us into adulthood. The wallflowers will stay shy and reticent, though they will learn in time to be a little more sociable and assertive. And the average kids, the more resilient ones, will remain so. " source.
We know. You could have just asked your mom. She would have told you that you were born with your personality.
She then would have told you to make sure that you're saving at least 20% of your research money for a rainy day. Oh, and do you need some new socks? She saw some for sale last week in ShopKo but can't remember if you like the goldtoe or some ankle-highs. Call her as soon as you can because your Cousin Louise is coming into town and she'd like to see the kids.