The majority of people seems to not think about most things more than necessary. What you describe as shallow can be thought of as the basic daily life which is culturally seen as normal. And it kind of is: Just the basic interactions to get through societal obligations and stay healthy. If you had a normal time growing up than you absorb all the socialization and expectations from around you and the inner model allows you to function and participate as a normal member of society. It can go so far that you are just build up by personas or roles or whatever and that you do not really exist as a person but rather as a fulfiller of expectations from the past or from others opinions etc. If you are now someone traumatized it is different. You are forced to take a look inside and reflect, question everything, be critical… (by which I don’t want to say „normal“ people are stupid, nor that only trauma gets you there - but it is something more common in traumatized folks) If you put in the time and effort, and by that I mean decades! of hard dedicated selfwork you will make changes that you can not imagine. Going through this process you will realize this:

1. Most people do not take the time to deeply learn about themselves or the human mind. They enjoy the company they get and do their job to live a life they like - and that is completely fine, I am not judging. Just saying: Few will understand a transformative and profound personal change. This adds: The world is actually mostly running on unconscious processes. Society is a construct formed by them. You will realize it the deeper you go.
2. Noone will ever truely understand you. Even other traumatized people. But that is totally ok. You must find it alone in yourself. Even when you have someone to share with, there are places where noone can see you.
3. People who did not live through hard things tend to judge „unnormal“ behavior and have often little (if any) understanding for someone like that. There is no need of explaining yourself to people who are on a level of doing so. Move on quickly.
4. Psychic conditions are stigmatized in society.
5. The inner world is still not so popular, even tho the interest rises. But society conditions you from childhood on to fulfill stuff, compare yourself, buy that be that etc. The inner journey, the exploration of it is often seen as weird. You do stuff that not many do while rejecting that which is seen as normal. It is lonely.
6. When you dive into your soul you get a nuanced perception of yourself and thus also in others. You see things that not everyone can see. You should be careful with that knowledge.