As a small child, I had all the hallmarking of insular behaviour. I had an insular personality. I mostly shied away from people and the world in general. I hated being noticed. My upbringing and environment had a lot to do with it.
It could be that we are generally that way, just very quiet people, but not being supported or encouraged, are other reasons why we may follow insular patterns. I also believe that some of the way we behave is in our genes.
Families are mostly well intentioned, but sadly that’s not always how it works. I know that had my disability been addressed and I had been encouraged, my behaviour would have changed.
Of course, being insular will also have a marked effect on our relationships. If children aren’t parented correctly, they will fail to understand how to form relationships later on. People are insular for a reason and that’s no excuse for others to leave us there.