Does God choose your personality or do you choose how you act for instance how outgoing a person is or how reserved?

This question is basically a nature vs. nurture question. With all of these types of questions it is never cut and dry. There is a certain amount of genetics that are at play but we are conditioned in certain ways too. Usually personality traits are passed on by the parents, they also shape the personality through the upbringing too. That is the clinical secular answer, now for the spritual and as I would consider real answer. Yes He does. We are shaped by His design and are called to whatever His purpose is. Whatever your personality it is somehow someway in His plan.