What is not a disorder? What the hell is " normal"? In my opinion we're all born with, or we learn behaviours, some are habits.
Major Depression, past on to me, then onto my daughter and son. Some learned behavior, as I got older I realized that I had habits of thinking that made things worse, teaching others how to treat you is one, two, don't ever climb down into a hole of dark thinking,get rid of stinking thinking like turnng off a light. Don't ignore those thought but, don't let it control you. This is just a couple of things I learned and past on to my children. Things happen to us that form are thinking, never be a victim. Sorry for preaching.