Often, it seems that people are not fully aware of the strategies they are following in various situations, or the reasons behind their choices. Psychological experiments have repeatedly demonstrated that factors that people do not consciously acknowledge can nonetheless affect things like knowledge and decision-making. That said, it stands to reason that people are not always fully aware of why they behave as they do, in relation to things like career choices and interpersonal relationships.
The task of trying to identify one’s ‘real’ motivations is a challenging one, with at least two types of error possible. On the one hand, it is possible to accept overly superficial explanations: ‘I stormed out of there because I found the offer unacceptable.’ While this may be true in a sense, it probably doesn’t capture the entirety of your thought process, or the factors that had put you in that particular state of mind. On the other hand, it is also possible to over-interpret your own decisions, in an almost paranoid way, and see them as more cynical or strategic than they really are.
I suppose all of this is indicative of how perplexing it is to be a creature that can never really step outside itself for purposes of comprehension. We have more information than anybody else about what makes us act as we do, but the same cognitive filters that determine how we act make it difficult or impossible for us to understand the process objectively.