How Easy? Easy, depending on your definition of manipulation and of society (semantics always make it hard to have good faith conversations).
Most of our life that is dictated by things out of our individual control because so much of larger society going back centuries is designed around the vulnerabilities of our psyche and extracting value and other resources from the masses. It starts from a young age and it never ends because we are seen as potential profit or to help generate further profit. Depending on how cynical or utilitarian you are, you can apply the same principle to how we develop or maintain relationships with other people, groups, communities, etc. There's always some sort of "value" being assessed and extracted. That said, with people it may be generally easier to find the relationship mutually beneficial.
I think most people eventually develop the idea that the world can be a harsh and callous place, but it can go a lot of places from there. For some, it becomes fuel to fight for a better world for yourself and others. For others, it makes them paranoid and hyper-vigilant, distrusting of others, and only prioritizing themselves. The reality for most is somewhere in the middle, probably leaning towards the latter.
How do you know if you are? Well, I think the first step is acceptance that you are and that a lot of it is outside of our control. Sure, we can try to manage some of the variables, but you have to choose your battles carefully or you'll end up overwhelmed. A lot of advice focuses on introspection and asking yourself why, which is worth continuing to encourage. I'd argue that it's equally as important to ask others the same questions, because without context how can we really understand ourselves? Never accept the answer from yourself or others that "I just like it/I just do/it's not that deep".
Unsolicited advice, but don't get too caught up in trying to know and control everything because no one can and it's okay to be realistic. Make sure you have people around you that make you feel understood and valid (whether friends, family, therapists, colleagues, etc.), but also make sure to get out of your comfort bubble so that the existence of something different doesn't feel threatening to you now or later on.
You asked two great questions that suggest that you are thoughtful and try to be self-aware, which often means you are on a good path already. Just don't get too jaded by the answers you uncover!