system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Where does innate shyness come from?

Never really knew any simple scientific explanation behind shyness which is hindering a lot of people from become the best version of themselves growing up and even as adults..

Is being shy hereditary or is it developed from childhood?
Some kids start off super shy for some reason and some kids are considerably more confident than others.. Does it have something to do with someone's upbringing in their early stages in life or the environment they live in also has an influence?
gpt
This is kind of a hard thing to address because personality traits can be genetically predisposed, environmentally activated, and socially learned. 

Let’s say little Jimmy is born with genes that say he’s going to be outgoing. If Jimmy were to be subject to abuse or neglect during his developmental periods, his body could actually disable these genes and reconfigure them to make him shy - this is an area of research called **epigenetics.**

From a social standpoint, behaviors can also be learned through a psychological phenomenon called classic conditioning, which is how your brain learns to relate an unrelated thing to something more relevant to you - say, you’re a prisoner and someone brings you a meal every day, but this person has a distinct type of sound when they walk. You would eventually associate this sound with food. The same concept applies to behaviors. If you’re outgoing and you’re repeatedly belittled for it, or one **significant** negative response occurs, your brain will associate extroverted characteristics with that negative response.

To sum it up in a more general way, anything psychological is also biological. Nurture (environment and social conditions) works on nature (genetic predispositions).